Supplementary Balance Sheet Information (Components Of Accounts Payable And Accrued Liabilities) (Details) - USD ($) $ in Thousands	Oct. 31, 2021	Jul. 31, 2021	Oct. 31, 2020
Balance Sheet Related Disclosures [Abstract]
Trade payables	$ 116,501	$ 98,261	$ 74,609
Deferred revenue	743,809	456,457	559,323
Accrued salaries, wages and deferred compensation	45,439	47,368	39,625
Accrued benefits	43,875	35,263	20,644
Deposits	43,773	54,286	33,131
Operating Lease, Liability, Current	36,036	34,668	36,185
Other liabilities	80,219	89,169	83,097
Total accounts payable and accrued liabilities	$ 1,109,652	$ 815,472	$ 846,614