| **Supplementary Balance Sheet Information (Components Of Accounts Payable And Accrued Liabilities) (Details) (USD $)In Thousands, unless otherwise specified** | Apr. 30, 2015                                       | Jul. 31, 2014                                       | Apr. 30, 2014                                       |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------|-----------------------------------------------------|-----------------------------------------------------|-----------------------------------------------------|
| **Balance Sheet Related Disclosures [Abstract]**                                                                                                               |                                                |                                                |                                                |
| Trade payables                                                                                                                                                 | $ 52,371us-gaap_AccountsPayableTradeCurrent         | $ 71,823us-gaap_AccountsPayableTradeCurrent         | $ 48,406us-gaap_AccountsPayableTradeCurrent         |
| Deferred revenue                                                                                                                                               | 115,300us-gaap_DeferredRevenueCurrent               | 110,566us-gaap_DeferredRevenueCurrent               | 93,135us-gaap_DeferredRevenueCurrent                |
| Accrued salaries, wages and deferred compensation                                                                                                              | 38,594us-gaap_AccruedSalariesCurrent                | 29,833us-gaap_AccruedSalariesCurrent                | 35,221us-gaap_AccruedSalariesCurrent                |
| Accrued benefits                                                                                                                                               | 26,459us-gaap_AccruedEmployeeBenefitsCurrent        | 21,351us-gaap_AccruedEmployeeBenefitsCurrent        | 25,468us-gaap_AccruedEmployeeBenefitsCurrent        |
| Deposits                                                                                                                                                       | 18,199mtn_DeferredRealEstateAndOtherDepositsCurrent | 15,272mtn_DeferredRealEstateAndOtherDepositsCurrent | 17,772mtn_DeferredRealEstateAndOtherDepositsCurrent |
| Accrued interest                                                                                                                                               | 7,865us-gaap_InterestPayableCurrent                 | 5,429us-gaap_InterestPayableCurrent                 | 13,549us-gaap_InterestPayableCurrent                |
| Other accruals                                                                                                                                                 | 34,268us-gaap_OtherAccruedLiabilitiesCurrent        | 34,944us-gaap_OtherAccruedLiabilitiesCurrent        | 31,226us-gaap_OtherAccruedLiabilitiesCurrent        |
| Total accounts payable and accrued liabilities                                                                                                                 | $ 293,056mtn_AccountsPayableAccruedLiabilities      | $ 289,218mtn_AccountsPayableAccruedLiabilities      | $ 264,777mtn_AccountsPayableAccruedLiabilities      |

| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
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| - Definition
Carrying amount as of the balance sheet date of liabilities incurred (of which invoices have been received and for which invoice have not yet been received or will not be rendered). Includes deferred revenue, accrued interest expense, deposits, accrued salaries, wages and benefits and other accrued liabilities.
+ References
No definition available.
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| - Definition
Deferred Real Estate and Other Deposits, Current
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| - Definition
Carrying value as of the balance sheet date of obligations incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).
+ References
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| - Definition
Carrying value as of the balance sheet date of obligations, excluding pension and other postretirement benefits, incurred through that date and payable for perquisites provided to employees pertaining to services received from them. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Carrying value as of the balance sheet date of the obligations incurred through that date and payable for employees' services provided. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).
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| - Definition
The carrying amount of consideration received or receivable as of the balance sheet date on potential earnings that were not recognized as revenue in conformity with GAAP, and which are expected to be recognized as such within one year or the normal operating cycle, if longer, including sales, license fees, and royalties, but excluding interest income.
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| - Definition
Carrying value as of the balance sheet date of [accrued] interest payable on all forms of debt, including trade payables, that has been incurred and is unpaid. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Carrying value as of the balance sheet date of obligations incurred through that date and payable arising from transactions not otherwise specified in the taxonomy. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).
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