Long-Term Debt Long-Term Debt (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Oct. 31, 2016	Oct. 31, 2015	Jul. 31, 2016
Gross interest expense	$ 12,000	$ 10,600
Long-term Debt	1,414,816	830,377	$ 702,320
Amortization of deferred financing costs	200	200
Unamortized Debt Issuance Expense	$ 4,663	2,261	2,057
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
Long-term Debt	$ 750,000	250,000	240,625
Debt Instrument, Interest Rate, Stated Percentage	1.70%
Long-term Debt, Description	The term loan facility is subject to quarterly amortization of principal, which begins on January 31, 2017, in equal installments, with five percent payable in each year and the final payment of all amounts outstanding, plus accrued and unpaid interest due October 2021.
Credit Facility Revolver [Member]
Line of Credit Facility, Maximum Borrowing Capacity	$ 400,000
Long-term Debt	$ 135,000	197,500	75,000
Whistler Credit Agreement revolver [Member]
Line of Credit Facility, Initiation Date	Nov. 12, 2013
Debt Instrument, Maturity Date	Nov. 12, 2021
Long-term Debt	$ 142,103	$ 0	$ 0
Debt Instrument, Interest Rate, Stated Percentage	2.70%
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 October 31, 2016, in the case of borrowings (i) in Canadian Dollars, at the WB Partnerships’ option, either (a) at the Canadian Prime Rate plus 1.0% per annum or (b) by way of the issuance of bankers’ acceptances at a stamping fee of 2.00% 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) Banker’s 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
Line of Credit Facility, Maximum Borrowing Capacity	$ 300,000