Supplementary Balance Sheet Information (Components Of Accounts Payable And Accrued Liabilities) (Details) - USD ($) $ in Thousands	Jan. 31, 2022	Jul. 31, 2021	Jan. 31, 2021
Balance Sheet Related Disclosures [Abstract]
Trade payables	$ 137,895	$ 98,261	$ 86,251
Deferred revenue	611,477	456,457	480,353
Accrued salaries, wages and deferred compensation	46,894	47,368	44,549
Accrued benefits	80,547	35,263	31,472
Deposits	59,008	54,286	59,665
Operating Lease, Liability, Current	35,438	34,668	36,878
Other liabilities	95,878	89,169	92,626
Total accounts payable and accrued liabilities	$ 1,067,137	$ 815,472	$ 831,794