Supplementary Balance Sheet Information (Components Of Accounts Payable And Accrued Liabilities) (Details) - USD ($) $ in Thousands	Jul. 31, 2021	Jul. 31, 2020
Trade payables	$ 98,261	$ 59,692
Deferred Revenue, Current	456,457	256,402
Accrued salaries, wages and deferred compensation	54,286	25,588
Accrued benefits	47,368	43,704
Deposits	35,263	20,070
Current operating lease liability	34,668	36,604
Other accruals	89,169	57,048
Total accounts payable and accrued liabilities	$ 815,472	$ 499,108