| **Intangible Assets - Schedule of Intangible Assets (Details) (USD $)In Thousands, unless otherwise specified** | Jun. 30, 2013 | Mar. 31, 2013 |
|-----------------------------------------------------------------------------------------------------------------|---------------|---------------|
| **Amortized intangible assets:**                                                                                |          |          |
| Gross carrying amount, accumulated impairment                                                                   | $ 9,493       | $ 9,493       |
| Accumulated amortization, accumulated impairment                                                                | 0             | 0             |
| Net carrying amount, accumulated impairment                                                                     | (9,493)       | (9,493)       |
| Gross carrying amount                                                                                           | 24,215        | 23,610        |
| Accumulated amortization                                                                                        | 21,817        | 21,527        |
| Net carrying amount                                                                                             | 2,398         | 2,083         |
| **Unamortized intangible assets:**                                                                              |          |          |
| Accumulated impairment                                                                                          | 900           | 900           |
| Carrying amount                                                                                                 | 9,200         | 9,200         |
| Total intangible assets, gross carrying amount                                                                  | 33,415        | 32,810        |
| Intangible Assets, Net (Excluding Goodwill)                                                                     | 11,598        | 11,283        |
| Trade names [Member]                                                                                            |          |          |
| **Unamortized intangible assets:**                                                                              |          |          |
| Carrying amount, excluding accumulated impairment                                                               | 10,100        | 10,100        |
| Customer relationships [Member]                                                                                 |          |          |
| **Amortized intangible assets:**                                                                                |          |          |
| Gross carrying amount, excluding accumulated impairment                                                         | 10,775        | 10,775        |
| Accumulated amortization, excluding accumulated impairment                                                      | (9,404)       | (9,179)       |
| Net carrying amount, excluding accumulated impairment                                                           | 1,371         | 1,596         |
| Non-competition agreements [Member]                                                                             |          |          |
| **Amortized intangible assets:**                                                                                |          |          |
| Gross carrying amount, excluding accumulated impairment                                                         | 2,700         | 2,700         |
| Accumulated amortization, excluding accumulated impairment                                                      | (2,278)       | (2,213)       |
| Net carrying amount, excluding accumulated impairment                                                           | 422           | 487           |
| Developed technology [Member]                                                                                   |          |          |
| **Amortized intangible assets:**                                                                                |          |          |
| Gross carrying amount, excluding accumulated impairment                                                         | 20,153        | 19,548        |
| Accumulated amortization, excluding accumulated impairment                                                      | (10,055)      | (10,055)      |
| Net carrying amount, excluding accumulated impairment                                                           | 10,098        | 9,493         |
| Patented Technology [Member]                                                                                    |          |          |
| **Amortized intangible assets:**                                                                                |          |          |
| Gross carrying amount, excluding accumulated impairment                                                         | 80            | 80            |
| Accumulated amortization, excluding accumulated impairment                                                      | (80)          | (80)          |
| Net carrying amount, excluding accumulated impairment                                                           | $ 0           | $ 0           |

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| - Definition
Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.
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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.
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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.
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| - Definition
Carrying amount of assets (excluding financial assets) that lack physical substance, excluding goodwill, having a projected indefinite period of benefit.
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| - Definition
Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.
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