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Acquisitions (Narrative) (Details) $ / shares in Units, $ in Thousands, $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Jul. 31, 2017 USD ($) | Apr. 30, 2017 USD ($) | Oct. 31, 2016 USD ($) $ / shares shares | Oct. 31, 2016 CAD ($) shares | Apr. 30, 2018 USD ($) | Apr. 30, 2017 USD ($) | Oct. 17, 2016 USD ($) $ / shares | Oct. 14, 2016 $ / shares
Payments to Acquire Businesses, Net of Cash Acquired |  |  |  |  | $ 1,356 | $ 512,348 |  |
Stowe [Member] |  |  |  |  |  |  |  |
Business Acquisition, Effective Date of Acquisition | Jun. 07, 2017 |  |  |  |  |  |  |
Business Combination, Consideration Transferred | $ 40,700 |  |  |  |  |  |  |
Whistler Blackcomb [Member] |  |  |  |  |  |  |  |
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 |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent |  |  |  |  |  |  | 75.00% |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners |  |  |  |  |  |  | 25.00% |
United States of America, Dollars | Whistler Blackcomb [Member] |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  | $ 1,272,314 |
Realized Investment Gains (Losses) |  |  | 800 |  |  |  |  |
Payments to Acquire Businesses, Gross |  |  | 509,200 |  |  |  |  |
Foreign Currency Transaction Gain (Loss), Realized |  |  | $ 3,400 |  |  |  |  |
Business Acquisition, Transaction Costs |  | $ 3,200 |  |  |  |  |  |
Share Price | $ / shares |  |  |  |  |  |  |  | $ 153.41
Canada, Dollars | Whistler Blackcomb [Member] |  |  |  |  |  |  |  |
Business Acquisition, Share Price | $ / shares |  |  |  |  |  |  | $ 17.50 |
Business Combination, Consideration Transferred |  |  |  | $ 673.8 |  |  |  |
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 |  |  |  |

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