Supplementary Balance Sheet Information (Components Of Accounts Payable And Accrued Liabilities) (Details) - USD ($) $ in Thousands	Jul. 31, 2015	Jul. 31, 2014
Balance Sheet Related Disclosures [Abstract]
Trade payables	$ 62,099	$ 71,823
Deferred revenue	145,949	110,566
Accrued salaries, wages and deferred compensation	33,461	29,833
Accrued benefits	24,436	21,351
Deposits	19,336	15,272
Other accruals	46,018	40,373
Total accounts payable and accrued liabilities	$ 331,299	$ 289,218