Acquisitions (Narrative) (Details) $ / shares in Units, $ in Thousands, CAD in Millions		3 Months Ended			12 Months Ended
	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