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Acquisitions (Narrative) (Details) $ / shares in Units, $ in Thousands, CAD in Millions | 3 Months Ended | 9 Months Ended |  |  |
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Apr. 30, 2017 USD ($) | Oct. 31, 2016 USD ($) $ / shares shares | Oct. 31, 2016 CAD shares | Apr. 30, 2016 USD ($) | Apr. 30, 2017 USD ($) | Apr. 30, 2016 USD ($) | Oct. 17, 2016 USD ($) | Oct. 14, 2016 $ / shares | Jan. 19, 2016 USD ($)
Development Agreement Date |  |  |  |  | Feb. 23, 2017 |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired |  |  |  |  | $ 512,348 | $ 20,245 |  |  |
Noncontrolling Interest, Increase from Business Combination |  |  |  |  | 182,579 |  |  |  |
Goodwill Acquired During Period |  |  |  |  | $ 956,876 |  |  |  |
Description of Development Agreement |  |  |  |  | The MDAs each have a term of 60 years and are replaceable for an additional 60 years by option exercisable by the WB Partnerships after the first 30 years of the initial term. In accordance with the MDAs, each WB Partnership is obligated to pay annual fees to the Province at a rate of 2% of certain gross revenues related to the Whistler Blackcomb Resort. |  |  |  |
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 |  |  |  |  |  |
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 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment |  |  |  |  |  |  |  |  | $ 12,500
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill |  |  |  |  |  |  |  |  | 400
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets |  |  |  |  |  |  |  |  | 200
Goodwill Acquired During Period |  |  |  | $ 7,400 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable |  |  |  |  |  |  |  |  | $ 300
United States of America, Dollars | Whistler Blackcomb [Member] |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables |  |  |  |  |  |  | $ 37,567 |  |
Business Combination, Consideration Transferred |  | $ 1,087,203 |  |  |  |  |  |  |
Business Acquisition, Share Price | $ / shares |  | $ 13.31 |  |  |  |  |  |  |
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual |  |  |  |  | $ 229,700 |  |  |  |
Business Combination, Consideration Transferred |  | $ 512,558 |  |  |  |  |  |  |
Business Combination, Consideration Transferred, Other |  | 4,308 |  |  |  |  |  |  |
Total Estimated Purchase Consideration |  |  |  |  |  |  | 1,274,090 |  |
Realized Investment Gains (Losses) |  | 800 |  |  |  |  |  |  |
Goodwill, Purchase Accounting Adjustments |  |  |  |  | 7,700 |  |  |  |
Payments to Acquire Businesses, Gross |  | 509,200 |  |  |  |  |  |  |
Foreign Currency Transaction Gain (Loss), Realized |  | $ 3,400 |  |  |  |  |  |  |
Business Acquisition, Transaction Costs | $ 200 |  |  |  | 3,200 |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment |  |  |  |  |  |  | 332,609 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill |  |  |  |  |  |  | 152,035 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets |  |  |  |  |  |  | 1,907 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets |  |  |  |  |  |  | 144,922 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities |  |  |  |  |  |  | 75,175 |  |
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned |  |  |  |  |  |  | 574,645 |  |
Share Price | $ / shares |  |  |  |  |  |  |  | $ 153.41 |
Business Acquisition, Purchase Price Allocation, Real estate held for sale and investment |  |  |  |  |  |  | $ 8,216 |  |
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 |  |  | 182,579 |  |  |  |
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 |  |  |  |  | $ 956,876 |  |  |  |

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