Acquisitions (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended					9 Months Ended
	Apr. 30, 2016	Jan. 31, 2016	Jul. 31, 2015	Apr. 30, 2015	Oct. 31, 2014	Apr. 30, 2016	Apr. 30, 2015	Jan. 19, 2016	Jun. 30, 2015	Sep. 11, 2014
Business Acquisition, Pro Forma Revenue				$ 579,672			$ 1,282,926
Payments to Acquire Businesses, Net of Cash Acquired						$ 20,245	182,500
Long-term Debt	$ 629,178		$ 816,830	636,749		629,178	636,749
Business Acquisition, Pro Forma Net Income (Loss)				$ 129,187			$ 186,810
Business Acquisition, Pro Forma Earnings Per Share, Basic				$ 3.55			$ 5.14
Gain (Loss) Related to Litigation Settlement	0			$ 0		0	$ 16,400
Park City litigation payment to Talisker						0	$ (10,000)
Business Acquisition, Pro Forma Earnings Per Share, Diluted				$ 3.45			$ 5.00
Wilmot [Member]
Business Acquisition, Effective Date of Acquisition		Jan. 19, 2016
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		10 years
Business Combination, 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
PCMR [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables										$ 930
Business Acquisition, Effective Date of Acquisition					Sep. 11, 2014
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life					46 years
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual				$ 35,400			$ 63,800
Business Combination, Consideration Transferred					$ 182,500
Gain (Loss) Related to Litigation Settlement					16,400
Fair value of litigation settlement					10,100
Business Combination, Consideration Transferred, Other					26,500
Park City litigation payment to Talisker					10,000
Business Acquisition, Transaction Costs							800
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment										76,605
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill										27,650
Goodwill, Acquired During Period					$ 92,516
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets										215,204
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable										1,935
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Deferred Revenue										4,319
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities										$ 6,254
Perisher [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables									$ 1,494
Business Acquisition, Effective Date of Acquisition			Jun. 30, 2015
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life			4 years
Lease Expiration Date			Jan. 01, 2048
Optional Lease Renewal Term			20-year renewal option
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory									4,859
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment									126,287
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill									5,458
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets									525
Goodwill, Acquired During Period			$ 31,657
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets									170,280
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable									11,394
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Deferred Revenue									15,906
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Noncurrent									18,429
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities									$ 45,729
Canyons Obligation [Member]
Long-term Debt	$ 321,688		$ 317,455	$ 316,056		$ 321,688	$ 316,056