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Acquisitions (Summary Of Estimate Of Fair Value Of Identifiable Assets Acquired And Liabilities Assumed) (Details) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jul. 31, 2017 USD ($) | Oct. 31, 2016 USD ($) shares | Jan. 31, 2018 USD ($) | Jan. 31, 2017 USD ($) | Oct. 17, 2016 USD ($) | Oct. 14, 2016 $ / shares
Business Acquisition [Line Items] |  |  |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired |  |  | $ 1,356 | $ 512,348 |  |
Stowe [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business Combination, Cash Consideration Transferred | $ 40,700 |  |  |  |  |
Whistler Blackcomb [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Shares Purchased to Acquire Business | shares |  | 38,500 |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  | 5 years |  |  |  |
Foreign Currency Exchange Rate, Translation |  |  |  |  |  | 0.097294
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | shares |  | 3,746 |  |  |  |
United States of America, Dollars | Stowe [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment | 39,100 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill | 3,000 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets | 2,300 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities | $ (3,700) |  |  |  |  |
United States of America, Dollars | Whistler Blackcomb [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Indefinite-Lived Trademarks |  |  |  |  | $ 139,977 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables |  |  |  |  | 36,820 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment |  |  |  |  | 332,609 |
Business Acquisition, Purchase Price Allocation, Real estate held for sale and investment |  |  |  |  | 8,216 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill |  |  |  |  | 150,681 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets Noncurrent |  |  |  |  | 7,992 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets |  |  |  |  | 1,973 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities |  |  |  |  | (74,358) |
Business Combination, Consideration Transferred |  | $ 1,087,203 |  |  |  |
Finite-Lived Customer Relationships, Gross |  |  |  |  | 6,596 |
Payments to Acquire Management Contract Rights |  | 4,108 |  |  |  |
Share Price | $ / shares |  |  |  |  |  | $ 153.41
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned |  |  |  |  | 574,645 |
Business Combination, Cash Consideration Transferred |  | 512,558 |  |  |  |
Business Combination, Consideration Transferred, Other |  | 4,308 |  |  |  |
Total Estimated Purchase Consideration |  |  |  |  | 1,272,314 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt |  |  |  |  | (144,922) |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other |  |  |  |  | $ (3,156) |
Noncontrolling Interests [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Noncontrolling Interest, Increase from Business Combination |  | 180,803 |  |  |  |
Mountain [Member] | United States of America, Dollars | Whistler Blackcomb [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill Acquired During Period |  | $ 956,459 |  |  |  |

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