Long-Term Debt Long-Term Debt (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2018	Jan. 31, 2017	Jul. 31, 2017
Gross interest expense	$ 16,000	$ 14,200	$ 31,100	$ 26,200
Long-term Debt	1,224,508	1,259,576	1,224,508	1,259,576	$ 1,276,521
Amortization of deferred financing costs	300	300	600	500
Intercompany Foreign Currency Balance, Amount	210,000		210,000
Unamortized Debt Issuance Expense	3,726	4,476	3,726	4,476	4,100
Foreign currency gain on intercompany loans (Note 4)	10,337	5,166	$ 2,991	5,166
Term Loan [Member]
Line of Credit Facility, Initiation Date			Oct. 14, 2016
Line of Credit Facility, Increase (Decrease), Net			$ 509,400
Debt Instrument, Maturity Date			Oct. 14, 2021
Long-term Line of Credit	750,000		$ 750,000
Long-term Debt	$ 703,125	740,625	$ 703,125	740,625	721,875
Debt Instrument, Interest Rate, Stated Percentage	2.82%		2.82%
Long-term Debt, Description			the term loan facility is subject to quarterly principal payments of approximately $9.4 million, which began on January 31, 2017. Final payment of the remaining principal outstanding plus accrued and unpaid interest is due upon maturity in October 2021.
Credit Facility Revolver [Member]
Line of Credit Facility, Maximum Borrowing Capacity	$ 400,000		$ 400,000
Long-term Debt	30,000	0	$ 30,000	0	50,000
Whistler Credit Agreement revolver [Member]
Line of Credit Facility, Initiation Date			Nov. 12, 2013
Debt Instrument, Maturity Date			Nov. 12, 2022
Long-term Debt	$ 97,571	$ 129,966	$ 97,571	$ 129,966	$ 113,119
Debt Instrument, Interest Rate, Stated Percentage	3.36%		3.36%
Long-term Debt, Description			Borrowings under the Whistler Credit Agreement are available in Canadian or U.S. dollars and bear interest annually, subject to an applicable margin based on the WB Partnerships’ Consolidated Total Leverage Ratio (as defined in the Whistler Credit Agreement), with pricing as of January 31, 2018, in the case of borrowings (i) in Canadian dollars, at the WB Partnerships’ option, either (a) at the Canadian Prime Rate plus 0.75% per annum or (b) by way of the issuance of bankers’ acceptances plus 1.75% per annum; and (ii) in U.S. dollars, at the WB Partnerships option, either at (a) the U.S. Base Rate plus 0.75% per annum or (b) Bankers Acceptance Rate plus 1.75% per annum
Debt Instrument, Unused Borrowing Capacity, Fee			0.3937%
Canada, Dollars | Whistler Credit Agreement revolver [Member]
Line of Credit Facility, Remaining Borrowing Capacity	$ 75,000		$ 75,000
Line of Credit Facility, Maximum Borrowing Capacity	$ 300,000		$ 300,000