Acquisitions (Summary Of Estimate Of Fair Value Of Identifiable Assets Acquired And Liabilities Assumed) (Details) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Oct. 31, 2017 USD ($)	Jul. 31, 2017 USD ($)	Oct. 31, 2016 USD ($) shares	Oct. 17, 2016 USD ($)	Oct. 14, 2016 $ / shares
Business Acquisition [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired	$ 1,356		$ 512,348
Stowe [Member]
Business Acquisition [Line Items]
Business Combination, Cash Consideration Transferred		$ 40,700
Whistler Blackcomb [Member]
Business Acquisition [Line Items]
Shares Purchased to Acquire Business | shares			38,500
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life			5 years
Foreign Currency Exchange Rate, Translation					0.097294
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | shares			3,746
United States of America, Dollars | Stowe [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment		39,100
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill		3,000
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 Acquisition [Line Items]
Indefinite-Lived Trademarks				$ 139,977
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables				36,820
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment				332,609
Business Acquisition, Purchase Price Allocation, Real estate held for sale and investment				8,216
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill				150,681
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets Noncurrent				7,992
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				(74,358)
Business Combination, Consideration Transferred			$ 1,087,203
Finite-Lived Customer Relationships, Gross				6,596
Payments to Acquire Management Contract Rights			4,108
Share Price | $ / shares					$ 153.41
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned				574,645
Business Combination, Cash Consideration Transferred			512,558
Business Combination, Consideration Transferred, Other			4,308
Total Estimated Purchase Consideration				1,272,314
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt				(144,922)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other				$ (3,156)
Noncontrolling Interests [Member]
Business Acquisition [Line Items]
Noncontrolling Interest, Increase from Business Combination			180,803
Mountain [Member] | United States of America, Dollars | Whistler Blackcomb [Member]
Business Acquisition [Line Items]
Goodwill Acquired During Period			$ 956,459