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Stock Repurchase Plan (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Apr. 30, 2015 | Apr. 30, 2014 | Apr. 30, 2015 | Apr. 30, 2014 | Jul. 31, 2014 | Jul. 16, 2008 | Mar. 09, 2006
Payments for Repurchase of Equity [Abstract] |  |  |  |  |  |  |
Number of shares authorized to repurchase |  |  |  |  |  |  | 3,000,000 us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased
Additional number of shares authorized to repurchase |  |  |  |  |  | 3,000,000 mtn_StockRepurchaseProgramAdditionalNumberOfSharesAuthorizedToBeRepurchased |
Treasury Stock, Shares, Acquired | 0 us-gaap_TreasuryStockSharesAcquired | 0 us-gaap_TreasuryStockSharesAcquired | 0 us-gaap_TreasuryStockSharesAcquired | 0 us-gaap_TreasuryStockSharesAcquired |  |  |
Number of shares repurchased since inception | 4,949,111 us-gaap_TreasuryStockShares | 4,949,111 us-gaap_TreasuryStockShares | 4,949,111 us-gaap_TreasuryStockShares | 4,949,111 us-gaap_TreasuryStockShares | 4,949,111 us-gaap_TreasuryStockShares |  |
Value of stock repurchased since inception | $ (193,192)us-gaap_TreasuryStockValue | $ (193,192)us-gaap_TreasuryStockValue | $ (193,192)us-gaap_TreasuryStockValue | $ (193,192)us-gaap_TreasuryStockValue | $ (193,192)us-gaap_TreasuryStockValue |  |
Remaining shares available for repurchase under existing program | 1,050,889 us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased |  | 1,050,889 us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased |  |  |  |

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- Definition Stock Repurchase Program, Additional Number of Shares Authorized to be Repurchased + References No definition available. + Details
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- Details
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- Definition The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
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- Definition The remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
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- Definition Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28,29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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- Definition Number of shares that have been repurchased during the period and are being held in treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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- Definition The amount allocated to treasury stock. Treasury stock is common and preferred shares of an entity that were issued, repurchased by the entity, and are held in its treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23315-112656 + Details
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