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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								12 Months Ended
	Apr. 30, 2019	Jan. 31, 2019	Oct. 31, 2018	Jul. 31, 2018	Apr. 30, 2018	Jan. 31, 2018	Oct. 31, 2017	Jul. 31, 2017	Apr. 30, 2019	Apr. 30, 2018
Inventory [Line Items]
Net earnings	$ (1,197)	$ 15	$ 1,454	$ 1,416	$ 1,613	$ 888	$ 1,765	$ 1,192	$ 1,688	$ 5,458
Change in assets and liabilities:
Inventories									456	(2,866)
Other, net									(1,685)	(1,565)
Net cash provided by operating activities									2,490	$ 3,183
Adjustments
Inventory [Line Items]
Net earnings									(340)
Change in assets and liabilities:
Inventories									444
Other, net									(104)
Net cash provided by operating activities									0
LIFO
Inventory [Line Items]
Net earnings									1,348
Change in assets and liabilities:
Inventories									900
Other, net									(1,789)
Net cash provided by operating activities									$ 2,490

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