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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jan. 27, 2024
Jan. 28, 2023
Jan. 27, 2024
Jan. 28, 2023
Changes in Accumulated Other Comprehensive Income (Loss) By Component        
Stockholders' equity, beginning balance $ 230,740,000 $ 294,767,000 $ 247,310,000 $ 322,651,000
Release of cumulative foreign currency translation adjustments associated with discontinued operations 0 2,501,000 (1,129,000) 889,000
Total other comprehensive income (loss), net of tax 49,000 3,442,000 (959,000) 1,644,000
Stockholders' equity, ending balance 213,271,000 255,277,000 213,271,000 255,277,000
Losses on available-for-sale securities 0 0 0 0
Total        
Changes in Accumulated Other Comprehensive Income (Loss) By Component        
Stockholders' equity, beginning balance (481,000) (5,325,000) 527,000 (3,527,000)
Other comprehensive income (loss) before reclassifications 49,000 3,442,000 (2,104,000) 1,662,000
Amounts reclassified from AOCI     0 (18,000)
Release of cumulative foreign currency translation adjustments associated with discontinued operations     1,145,000 0
Total other comprehensive income (loss), net of tax 49,000 3,442,000 (959,000) 1,644,000
Stockholders' equity, ending balance (432,000) (1,883,000) (432,000) (1,883,000)
Available-for-sale Securities        
Changes in Accumulated Other Comprehensive Income (Loss) By Component        
Stockholders' equity, beginning balance (481,000) (2,526,000) (602,000) (2,340,000)
Other comprehensive income (loss) before reclassifications 49,000 941,000 170,000 773,000
Amounts reclassified from AOCI     0 (18,000)
Release of cumulative foreign currency translation adjustments associated with discontinued operations     0 0
Total other comprehensive income (loss), net of tax 49,000 941,000 170,000 755,000
Stockholders' equity, ending balance (432,000) (1,585,000) (432,000) (1,585,000)
Foreign Currency Translation        
Changes in Accumulated Other Comprehensive Income (Loss) By Component        
Stockholders' equity, beginning balance 0 (2,799,000) 1,129,000 (1,187,000)
Other comprehensive income (loss) before reclassifications 0 2,501,000 (2,274,000) 889,000
Amounts reclassified from AOCI     0 0
Release of cumulative foreign currency translation adjustments associated with discontinued operations     1,145,000 0
Total other comprehensive income (loss), net of tax 0 2,501,000 (1,129,000) 889,000
Stockholders' equity, ending balance $ 0 $ (298,000) $ 0 $ (298,000)