Financial Instruments - Amortized Cost and Estimated Fair Value (Details) - USD ($)	Aug. 01, 2021	Aug. 02, 2020
Amortized Cost
Due within one year	$ 355,927,000
Due in one to five years	579,137,000
Due in five to ten years	3,930,000
Total	938,994,000
Fair Value
Due within one year	358,013,000
Due in one to five years	582,333,000
Due in five to ten years	3,939,000
Total	944,285,000
Impairment charge for unrealized losses	$ 0	$ 0