| **Fair Value Measurements (Details) $ in Thousands**                                                       |         | 9 Months Ended | 12 Months Ended |         |         |
|------------------------------------------------------------------------------------------------------------|---------|----------------|-----------------|---------|---------|
||
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**           |    |           |            |    |    |
| Change in fair value of TransWeb contingent earn-out                                                       |    | $ 0            | $ 0             |    |    |
| FiberRio Technology Corporation [Member]                                                                   |    |           |            |    |    |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**           |    |           |            |    |    |
| Contingent earn-out                                                                                        |    |           |            | $ 3,887 |    |
| Filter Resources, Inc. [Member]                                                                            |    |           |            |    |    |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**           |    |           |            |    |    |
| Contingent earn-out                                                                                        |    | 6              |            |    | $ 1,154 |
| TransWeb [Member]                                                                                          |    |           |            |    |    |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**           |    |           |            |    |    |
| Contingent earn-out                                                                                        | $ 1,018 |           |            |    |    |
| Number of former owners | owner                                                                            | 1       |           |            |    |    |
| Estimate of Fair Value Measurement [Member]                                                                |    |           |            |    |    |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**           |    |           |            |    |    |
| Long-term debt, fair value                                                                                 |    | 313,979        | 403,821         |    |    |
| Reported Value Measurement [Member]                                                                        |    |           |            |    |    |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**           |    |           |            |    |    |
| Long-term debt, fair value                                                                                 |    | 318,032        | 405,156         |    |    |
| Other Noncurrent Assets [Member]                                                                           |    |           |            |    |    |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**           |    |           |            |    |    |
| Restricted trust, included in Other noncurrent assets                                                      |    | 641            | 729             |    |    |
| Accrued Liabilities [Member]                                                                               |    |           |            |    |    |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**           |    |           |            |    |    |
| Foreign exchange contracts, included in Accrued liabilities                                                |    | 459            | 424             |    |    |
| Accrued Liabilities [Member] | FiberRio Technology Corporation [Member]                                    |    |           |            |    |    |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**           |    |           |            |    |    |
| Contingent earn-out                                                                                        |    | 3,887          |            |    |    |
| Accrued Liabilities [Member] | Filter Resources, Inc. [Member]                                             |    |           |            |    |    |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**           |    |           |            |    |    |
| Contingent earn-out                                                                                        |    |           | 1,285           |    |    |
| Accrued Liabilities [Member] | Foreign Exchange Contract [Member]                                          |    |           |            |    |    |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**           |    |           |            |    |    |
| Foreign exchange contracts, included in Accrued liabilities                                                |    | 459            | 40              |    |    |
| Prepaid Expenses and Other Current Assets [Member]                                                         |    |           |            |    |    |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**           |    |           |            |    |    |
| Foreign exchange contracts, included in Prepaid expenses and other current assets                          |    | 732            | 418             |    |    |
| Prepaid Expenses and Other Current Assets [Member] | Foreign Exchange Contract [Member]                    |    |           |            |    |    |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**           |    |           |            |    |    |
| Foreign exchange contracts, included in Prepaid expenses and other current assets                          |    | 89             | 418             |    |    |
| Level 1 [Member] | Other Noncurrent Assets [Member]                                                        |    |           |            |    |    |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**           |    |           |            |    |    |
| Restricted trust, included in Other noncurrent assets                                                      |    | 641            | 729             |    |    |
| Level 1 [Member] | Accrued Liabilities [Member] | FiberRio Technology Corporation [Member]                 |    |           |            |    |    |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**           |    |           |            |    |    |
| Contingent earn-out                                                                                        |    | 0              |            |    |    |
| Level 1 [Member] | Accrued Liabilities [Member] | Filter Resources, Inc. [Member]                          |    |           |            |    |    |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**           |    |           |            |    |    |
| Contingent earn-out                                                                                        |    | 0              | 0               |    |    |
| Level 1 [Member] | Accrued Liabilities [Member] | Foreign Exchange Contract [Member]                       |    |           |            |    |    |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**           |    |           |            |    |    |
| Foreign exchange contracts, included in Accrued liabilities                                                |    | 0              | 0               |    |    |
| Level 1 [Member] | Prepaid Expenses and Other Current Assets [Member] | Foreign Exchange Contract [Member] |    |           |            |    |    |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**           |    |           |            |    |    |
| Foreign exchange contracts, included in Prepaid expenses and other current assets                          |    | 0              | 0               |    |    |
| Level 2 [Member] | Other Noncurrent Assets [Member]                                                        |    |           |            |    |    |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**           |    |           |            |    |    |
| Restricted trust, included in Other noncurrent assets                                                      |    | 0              | 0               |    |    |
| Level 2 [Member] | Accrued Liabilities [Member] | FiberRio Technology Corporation [Member]                 |    |           |            |    |    |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**           |    |           |            |    |    |
| Contingent earn-out                                                                                        |    | 0              |            |    |    |
| Level 2 [Member] | Accrued Liabilities [Member] | Filter Resources, Inc. [Member]                          |    |           |            |    |    |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**           |    |           |            |    |    |
| Contingent earn-out                                                                                        |    | 0              | 0               |    |    |
| Level 2 [Member] | Accrued Liabilities [Member] | Foreign Exchange Contract [Member]                       |    |           |            |    |    |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**           |    |           |            |    |    |
| Foreign exchange contracts, included in Accrued liabilities                                                |    | 459            | 40              |    |    |
| Level 2 [Member] | Prepaid Expenses and Other Current Assets [Member] | Foreign Exchange Contract [Member] |    |           |            |    |    |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**           |    |           |            |    |    |
| Foreign exchange contracts, included in Prepaid expenses and other current assets                          |    | 89             | 418             |    |    |
| Level 3 [Member] | Other Noncurrent Assets [Member]                                                        |    |           |            |    |    |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**           |    |           |            |    |    |
| Restricted trust, included in Other noncurrent assets                                                      |    | 0              | 0               |    |    |
| Level 3 [Member] | Accrued Liabilities [Member] | FiberRio Technology Corporation [Member]                 |    |           |            |    |    |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**           |    |           |            |    |    |
| Contingent earn-out                                                                                        |    | 3,887          |            |    |    |
| Level 3 [Member] | Accrued Liabilities [Member] | Filter Resources, Inc. [Member]                          |    |           |            |    |    |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**           |    |           |            |    |    |
| Contingent earn-out                                                                                        |    | 6              | 1,285           |    |    |
| Level 3 [Member] | Accrued Liabilities [Member] | Foreign Exchange Contract [Member]                       |    |           |            |    |    |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**           |    |           |            |    |    |
| Foreign exchange contracts, included in Accrued liabilities                                                |    | 0              | 0               |    |    |
| Level 3 [Member] | Prepaid Expenses and Other Current Assets [Member] | Foreign Exchange Contract [Member] |    |           |            |    |    |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**           |    |           |            |    |    |
| Foreign exchange contracts, included in Prepaid expenses and other current assets                          |    | 0              | 0               |    |    |
| Mutual fund investments - equities [Member] | Other Noncurrent Assets [Member]                             |    |           |            |    |    |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**           |    |           |            |    |    |
| Restricted trust, included in Other noncurrent assets                                                      |    | 302            | 352             |    |    |
| Mutual fund investments - equities [Member] | Level 1 [Member] | Other Noncurrent Assets [Member]          |    |           |            |    |    |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**           |    |           |            |    |    |
| Restricted trust, included in Other noncurrent assets                                                      |    | 302            | 352             |    |    |
| Mutual fund investments - equities [Member] | Level 2 [Member] | Other Noncurrent Assets [Member]          |    |           |            |    |    |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**           |    |           |            |    |    |
| Restricted trust, included in Other noncurrent assets                                                      |    | 0              | 0               |    |    |
| Mutual fund investments - equities [Member] | Level 3 [Member] | Other Noncurrent Assets [Member]          |    |           |            |    |    |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**           |    |           |            |    |    |
| Restricted trust, included in Other noncurrent assets                                                      |    | 0              | 0               |    |    |
| Mutual fund investments - bonds [Member] | Other Noncurrent Assets [Member]                                |    |           |            |    |    |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**           |    |           |            |    |    |
| Restricted trust, included in Other noncurrent assets                                                      |    | 322            | 363             |    |    |
| Mutual fund investments - bonds [Member] | Level 1 [Member] | Other Noncurrent Assets [Member]             |    |           |            |    |    |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**           |    |           |            |    |    |
| Restricted trust, included in Other noncurrent assets                                                      |    | 322            | 363             |    |    |
| Mutual fund investments - bonds [Member] | Level 2 [Member] | Other Noncurrent Assets [Member]             |    |           |            |    |    |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**           |    |           |            |    |    |
| Restricted trust, included in Other noncurrent assets                                                      |    | 0              | 0               |    |    |
| Mutual fund investments - bonds [Member] | Level 3 [Member] | Other Noncurrent Assets [Member]             |    |           |            |    |    |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**           |    |           |            |    |    |
| Restricted trust, included in Other noncurrent assets                                                      |    | 0              | 0               |    |    |
| Cash and Cash Equivalents [Member] | Other Noncurrent Assets [Member]                                      |    |           |            |    |    |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**           |    |           |            |    |    |
| Restricted trust, included in Other noncurrent assets                                                      |    | 17             | 14              |    |    |
| Cash and Cash Equivalents [Member] | Level 1 [Member] | Other Noncurrent Assets [Member]                   |    |           |            |    |    |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**           |    |           |            |    |    |
| Restricted trust, included in Other noncurrent assets                                                      |    | 17             | 14              |    |    |
| Cash and Cash Equivalents [Member] | Level 2 [Member] | Other Noncurrent Assets [Member]                   |    |           |            |    |    |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**           |    |           |            |    |    |
| Restricted trust, included in Other noncurrent assets                                                      |    | 0              | 0               |    |    |
| Cash and Cash Equivalents [Member] | Level 3 [Member] | Other Noncurrent Assets [Member]                   |    |           |            |    |    |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**           |    |           |            |    |    |
| Restricted trust, included in Other noncurrent assets                                                      |    | $ 0            | $ 0             |    |    |

| X                                                                                                                                                                                                                                                            |
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| - Definition
Number of Former Owners, Earn-out Payable
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| - Definition
Amount of liability recognized arising from contingent consideration in a business combination.
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| - Definition
Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.
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| - Definition
Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.
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| - Definition
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
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| - Definition
Amount of gain (loss) recognized on the income statement for financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.
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| - Definition
The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.
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| - Definition
Amount of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading.
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