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Leases - Narrative (Detail) - USD ($)
3 Months Ended 9 Months Ended
Jan. 31, 2021
Feb. 02, 2020
Jan. 31, 2021
Feb. 02, 2020
Lessee, Operating Lease, Option to Extend     renewal options for additional periods ranging up to ten years  
Operating Lease Expenses $ 713,000 $ 726,000 $ 2,100,000 $ 2,100,000
Minimum [Member]        
Operating Lease Remaining Lease Terms     1 year  
Maximum [Member]        
Operating Lease Remaining Lease Terms     4 years