Supplementary Balance Sheet Information (Components Of Accounts Payable And Accrued Liabilities) (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2016	Jul. 31, 2015
Balance Sheet Related Disclosures [Abstract]
Current Fiscal Year End Date	--07-31
Trade payables	$ 72,658	$ 62,099
Deferred revenue	182,506	145,949
Accrued salaries, wages and deferred compensation	43,086	33,461
Accrued benefits	29,175	24,436
Deposits	23,307	19,336
Other accruals	46,756	46,018
Total accounts payable and accrued liabilities	$ 397,488	$ 331,299