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Acquisitions (Narrative) (Details) $ / shares in Units, CAD in Millions | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Oct. 31, 2016 USD ($) $ / shares shares | Oct. 31, 2016 CAD shares | Jan. 31, 2016 USD ($) | Jan. 31, 2017 USD ($) | Jan. 31, 2016 USD ($) | Oct. 17, 2016 USD ($) | Oct. 14, 2016 $ / shares | Jan. 19, 2016 USD ($)
Payments to Acquire Businesses, Net of Cash Acquired |  |  |  | $ 512,348,000 | $ 20,245,000 |  |  |
Noncontrolling Interest, Increase from Business Combination |  |  |  | 182,579,000 |  |  |  |
Goodwill Acquired During Period |  |  |  | 956,086,000 |  |  |  |
Whistler Blackcomb [Member] |  |  |  |  |  |  |  |
Business Acquisition, Date of Acquisition Agreement | Aug. 05, 2016 | Aug. 05, 2016 |  |  |  |  |  |
Shares Purchased to Acquire Business | shares | 38,500,000 | 38,500,000 |  |  |  |  |  |
Foreign Currency Exchange Rate, Translation |  |  |  |  |  |  | 0.097294 |
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | shares | 3,746,000 | 3,746,000 |  |  |  |  |  |
Business Acquisition, Effective Date of Acquisition | Oct. 17, 2016 | Oct. 17, 2016 |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 5 years | 5 years |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent | 75.00% |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners | 25.00% |  |  |  |  |  |  |
Wilmot [Member] |  |  |  |  |  |  |  |
Business Acquisition, Effective Date of Acquisition |  |  | Jan. 19, 2016 |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  | 10 years |  |  |  |  |
Business Combination, Consideration Transferred |  |  | $ 20,200,000 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment |  |  |  |  |  |  |  | $ 12,500,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill |  |  |  |  |  |  |  | 400,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets |  |  |  |  |  |  |  | 200,000
Goodwill Acquired During Period |  |  | $ 7,400,000 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable |  |  |  |  |  |  |  | $ 300,000
United States of America, Dollars | Whistler Blackcomb [Member] |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables |  |  |  |  |  | $ 37,567,000 |  |
Business Combination, Consideration Transferred | $ 1,087,203,000 |  |  |  |  |  |  |
Business Acquisition, Share Price | $ / shares | $ 13.31 |  |  |  |  |  |  |
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual |  |  |  | 105,500,000 |  |  |  |
Business Combination, Consideration Transferred | $ 512,558,000 |  |  |  |  |  |  |
Business Combination, Consideration Transferred, Other | 4,308,000 |  |  |  |  |  |  |
Total Estimated Purchase Consideration |  |  |  |  |  | 1,274,090,000 |  |
Realized Investment Gains (Losses) | 800,000 |  |  |  |  |  |  |
Goodwill, Purchase Accounting Adjustments |  |  |  | 8,500,000 |  |  |  |
Payments to Acquire Businesses, Gross | 509,200,000 |  |  |  |  |  |  |
Foreign Currency Transaction Gain (Loss), Realized | $ 3,400,000.0 |  |  |  |  |  |  |
Business Acquisition, Transaction Costs |  |  |  | 3,000,000 |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment |  |  |  |  |  | 332,609,000 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill |  |  |  |  |  | 152,035,000 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets |  |  |  |  |  | 1,907,000 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets |  |  |  |  |  | 144,922,000 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities |  |  |  |  |  | 74,108,000 |  |
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned |  |  |  |  |  | 574,645,000 |  |
Share Price | $ / shares |  |  |  |  |  |  | $ 153.41 |
Business Acquisition, Purchase Price Allocation, Real estate held for sale and investment |  |  |  |  |  | $ 8,216,000 |  |
Canada, Dollars | Whistler Blackcomb [Member] |  |  |  |  |  |  |  |
Business Acquisition, Share Price | $ / shares | $ 17.50 |  |  |  |  |  |  |
Business Combination, Consideration Transferred | CAD |  | CAD 673.8 |  |  |  |  |  |
Noncontrolling Interests [Member] |  |  |  |  |  |  |  |
Noncontrolling Interest, Increase from Business Combination | $ 182,579,000 |  |  | 182,579,000 |  |  |  |
Common Stock [Member] | Whistler Blackcomb [Member] |  |  |  |  |  |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | shares | 3,327,719 | 3,327,719 |  |  |  |  |  |
Exchangeable Shares [Member] | Whistler Blackcomb [Member] |  |  |  |  |  |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | shares | 418,095 | 418,095 |  |  |  |  |  |
Mountain [Member] | United States of America, Dollars | Whistler Blackcomb [Member] |  |  |  |  |  |  |  |
Goodwill Acquired During Period |  |  |  | $ 956,086,000 |  |  |  |

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