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Acquisitions (Narrative) (Details) $ / shares in Units, $ in Thousands, CAD in Millions |  | 3 Months Ended | 12 Months Ended |  |  |  |
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May 29, 2013 USD ($) | Oct. 31, 2016 | Apr. 30, 2016 USD ($) | Jan. 31, 2015 USD ($) | Jul. 31, 2017 USD ($) $ / shares shares | Jul. 31, 2017 CAD shares | Jul. 31, 2016 USD ($) | Jul. 31, 2015 USD ($) | Oct. 17, 2016 USD ($) | Jan. 19, 2016 USD ($) | Jun. 30, 2015 USD ($) | Sep. 11, 2014 USD ($)
Payments to Acquire Businesses, Net of Cash Acquired |  |  |  |  | $ 553,220 |  | $ 20,245 | $ 307,051 |  |  |  |
Canyons Obligation, Interest Rate |  |  |  |  | 10.00% |  |  |  |  |  |  |
Gain on litigation settlement (Note 5) |  |  |  |  | $ 0 |  | 0 | 16,400 |  |  |  |
Park City litigation settlement payment |  |  |  |  | 0 |  | 0 | 10,000 |  |  |  |
Goodwill, Acquired During Period |  |  |  |  | $ 956,739 |  | $ 7,400 |  |  |  |  |
Stowe [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Effective Date of Acquisition |  |  |  |  | Jun. 07, 2017 | Jun. 07, 2017 |  |  |  |  |  |
Business Combination, Cash Consideration Transferred |  |  |  |  | $ 40,900 |  |  |  |  |  |  |
Whistler Blackcomb [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Effective Date of Acquisition |  |  |  |  | Oct. 17, 2016 | Oct. 17, 2016 |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  | 5 years |  |  |  |  |  |  |  |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | shares |  |  |  |  | 3,746,000 | 3,746,000 |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent |  |  |  |  | 75.00% |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners |  |  |  |  | 25.00% |  |  |  |  |  |  |
Development Agreement Date |  |  |  |  | Feb. 23, 2017 | Feb. 23, 2017 |  |  |  |  |  |
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. | 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. |  |  |  |  |  |
Wilmot [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Effective Date of Acquisition |  |  | Jan. 19, 2016 |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill |  |  |  |  |  |  |  |  |  | $ 400 |  |
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, Current Assets, Prepaid Expense and Other Assets |  |  |  |  |  |  |  |  |  | 200 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable |  |  |  |  |  |  |  |  |  | $ 300 |  |
Goodwill, Acquired During Period |  |  | $ 7,400 |  |  |  |  |  |  |  |  |
Canyons [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Effective Date of Acquisition | May 24, 2013 |  |  |  |  |  |  |  |  |  |  |
Initial Capital Lease Term | 50 years |  |  |  |  |  |  |  |  |  |  |
Optional Lease Renewal Term | six 50-year renewal options |  |  |  |  |  |  |  |  |  |  |
Minimum Capital Lease Payment, Annual | $ 25,000 |  |  |  |  |  |  |  |  |  |  |
Adjustments to Capital Lease Annual Payments | inflation linked index of CPI less 1%, with a floor of 2% per annum |  |  |  |  |  |  |  |  |  |  |
Lease Expiration Date |  |  |  |  | Jan. 01, 2079 | Jan. 01, 2079 |  |  |  |  |  |
PCMR [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Effective Date of Acquisition |  |  |  |  |  |  | Sep. 11, 2014 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill |  |  |  |  |  |  |  |  |  |  |  | $ 27,650
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  |  |  |  |  | 46 years |  |  |  |  |
Net operation revenue from acquiree |  |  |  |  |  |  | $ 67,100 |  |  |  |  |
Business Combination, Separately Recognized Transactions, Additional Disclosures, Acquisition Cost Expensed |  |  |  |  |  |  |  | 800 |  |  |  |
Goodwill, Purchase Accounting Adjustments |  |  |  | $ 13,000 |  |  |  |  |  |  |  |
Business Combination, Cash Consideration Transferred |  |  |  |  |  |  | 182,500 |  |  |  |  |
Fair value of litigation settlement |  |  |  |  |  |  | 10,100 |  |  |  |  |
Gain on litigation settlement (Note 5) |  |  |  |  |  |  | 16,400 |  |  |  |  |
Litigation settlement accounted for as consideration |  |  |  |  |  |  | 26,500 |  |  |  |  |
Park City litigation settlement payment |  |  |  |  |  |  | $ (10,000) |  |  |  |  |
Business Combination, Consideration Transferred |  |  |  |  |  |  |  | $ 208,950 |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment |  |  |  |  |  |  |  |  |  |  |  | 76,605
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable |  |  |  |  |  |  |  |  |  |  |  | 1,935
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities |  |  |  |  |  |  |  |  |  |  |  | $ 6,254
Perisher [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Effective Date of Acquisition |  |  |  |  |  |  |  | Jun. 30, 2015 |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill |  |  |  |  |  |  |  |  |  |  | $ 5,458 |
Payments to Acquire Businesses, Net of Cash Acquired |  |  |  |  |  |  |  | $ 124,551 |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  |  |  |  |  |  | 4 years |  |  |  |
Net operation revenue from acquiree |  |  |  |  |  |  |  | $ 21,800 |  |  |  |
Business Combination, Separately Recognized Transactions, Additional Disclosures, Acquisition Cost Expensed |  |  |  |  |  |  |  | $ 5,200 |  |  |  |
Optional Lease Renewal Term |  |  |  |  | P20Y | P20Y |  | 20-year renewal option |  |  |  |
Lease Expiration Date |  |  |  |  | Jan. 01, 2048 | Jan. 01, 2048 |  | Jan. 01, 2048 |  |  |  |
Business Combination, Consideration Transferred |  |  |  |  |  |  |  | $ 124,551 |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment |  |  |  |  |  |  |  |  |  |  | 126,287 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets |  |  |  |  |  |  |  |  |  |  | 525 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable |  |  |  |  |  |  |  |  |  |  | 11,394 |
Goodwill, Acquired During Period |  |  |  |  |  |  |  | $ 31,657 |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities |  |  |  |  |  |  |  |  |  |  | $ 45,729 |
United States of America, Dollars | Stowe [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill |  |  |  |  | $ 3,000 |  |  |  |  |  |  |
Business Combination, Separately Recognized Transactions, Additional Disclosures, Acquisition Cost Expensed |  |  |  |  | 2,000 |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment |  |  |  |  | 39,300 |  |  |  |  |  |  |
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 Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill |  |  |  |  |  |  |  |  | $ 152,035 |  |  |
Net operation revenue from acquiree |  |  |  |  | 257,800 |  |  |  |  |  |  |
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual |  |  |  |  | 65,600 |  |  |  |  |  |  |
Business Combination, Separately Recognized Transactions, Additional Disclosures, Acquisition Cost Expensed |  |  |  |  | 3,200 |  |  |  |  |  |  |
Goodwill, Purchase Accounting Adjustments |  |  |  |  | 7,900 |  |  |  |  |  |  |
Business Combination, Cash Consideration Transferred |  |  |  |  | 512,558 |  |  |  |  |  |  |
Business Combination, Consideration Transferred |  |  |  |  | 1,087,203 |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment |  |  |  |  |  |  |  |  | 332,609 |  |  |
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 |  |  |  |  |  |  |  |  | $ 74,086 |  |  |
Payments to Acquire Businesses, Gross |  |  |  |  | 509,200 |  |  |  |  |  |  |
Foreign Currency Transaction Gain (Loss), Realized |  |  |  |  | 3,400 |  |  |  |  |  |  |
Business Combination, Consideration Transferred, Other |  |  |  |  | 4,308 |  |  |  |  |  |  |
Realized Investment Gains (Losses) |  |  |  |  | $ 800 |  |  |  |  |  |  |
Canada, Dollars | Whistler Blackcomb [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Cash Consideration Transferred | CAD |  |  |  |  |  | CAD 673.8 |  |  |  |  |  |
Business Acquisition, Share Price | $ / shares |  |  |  |  | $ 17.50 |  |  |  |  |  |  |
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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