Supplementary Balance Sheet Information (Components Of Accounts Payable And Accrued Liabilities) (Details) - USD ($) $ in Thousands	Apr. 30, 2022	Jul. 31, 2021	Apr. 30, 2021
Balance Sheet Related Disclosures [Abstract]
Trade payables	$ 104,101	$ 98,261	$ 64,412
Deferred revenue	326,008	456,457	238,075
Accrued salaries, wages and deferred compensation	55,453	47,368	49,958
Accrued benefits	45,820	35,263	35,263
Deposits	69,793	54,286	69,821
Operating Lease, Liability, Current	39,526	34,668	37,687
Other liabilities	101,544	89,169	72,048
Total accounts payable and accrued liabilities	$ 742,245	$ 815,472	$ 567,264