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Inventories - Schedule of Impact on the Company's Condensed Consolidated Statement of Cash Flows (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jan. 31, 2019
Jan. 31, 2018
Jan. 31, 2019
Jan. 31, 2018
Inventory [Line Items]        
Net earnings $ 15 $ 948 $ 2,885 $ 3,905
Decrease in inventories     990 (2,790)
Increase in accounts payable and other accrued expenses     (4,879) 2,035
Net cash used in operating activities     4,534 (645)
Adjustments        
Inventory [Line Items]        
Net earnings 37 30 (114) 30
Decrease in inventories     151 (45)
Increase in accounts payable and other accrued expenses     (37) 15
Net cash used in operating activities     0 0
As Computed Under LIFO        
Inventory [Line Items]        
Net earnings $ 52 $ 918 2,771 3,875
Decrease in inventories     1,141 (2,745)
Increase in accounts payable and other accrued expenses     (4,916) 2,020
Net cash used in operating activities     $ 4,534 $ (645)