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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		6 Months Ended
	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2018	Oct. 31, 2017
Inventory [Line Items]
Net earnings	$ 1,454	$ 1,765	$ 2,870	$ 2,957
Decrease (increase) in inventories			(565)	1,504
Decrease (increase) in accounts payable and other accrued expenses			(4,202)	3,514
Net cash provided by (used in) operating activities			2,301	$ (2,113)
Fifo [Member]
Inventory [Line Items]
Net earnings	1,454		2,870
Decrease (increase) in inventories			565
Decrease (increase) in accounts payable and other accrued expenses			(4,202)
Net cash provided by (used in) operating activities			2,301
Adjustments [Member]
Inventory [Line Items]
Net earnings	(76)		(151)
Decrease (increase) in inventories			200
Decrease (increase) in accounts payable and other accrued expenses			(49)
Lifo [Member]
Inventory [Line Items]
Net earnings	$ 1,378		2,719
Decrease (increase) in inventories			765
Decrease (increase) in accounts payable and other accrued expenses			(4,251)
Net cash provided by (used in) operating activities			$ 2,301

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The increase (decrease) during the reporting period in the amounts payable to vendors for goods and services received and the amount of obligations and expenses incurred but not paid.

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The increase (decrease) during the reporting period in the aggregate value of all inventory held by the reporting entity, associated with underlying transactions that are classified as operating activities.

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Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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