Commitments and Contingencies (Future Minimum Lease Payment) (Details) - USD ($) $ in Thousands	Jul. 31, 2016	Jul. 31, 2015
Debt Instrument [Line Items]
2013	$ 36,024
Capital Leases, Future Minimum Payments Due, Next Twelve Months	26,623
2014	31,642
Capital Leases, Future Minimum Payments Due in Two Years	27,156
2015	28,223
Capital Leases, Future Minimum Payments Due in Three Years	27,699
2016	25,448
Capital Leases, Future Minimum Payments Due in Four Years	28,253
2017	23,458
Capital Leases, Future Minimum Payments Due in Five Years	28,818
Thereafter	157,564
Capital Leases, Future Minimum Payments Due Thereafter	1,895,005
Total	302,359
Capital Leases, Future Minimum Payments Due	2,033,554
Capital Leases, Future Minimum Payments, Interest Included in Payments	(1,710,455)
Long-term Debt	702,320	$ 816,830
Canyons Obligation [Member]
Debt Instrument [Line Items]
Long-term Debt	$ 323,099	$ 317,455