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Segment Information - Segment Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Jul. 31, 2018	Jul. 31, 2017
Segment Reporting Information [Line Items]
Revenues from external customers	$ 42,152	$ 33,881
Earnings (loss) before income taxes	1,784	1,797
Corporate / Eliminations [Member]
Segment Reporting Information [Line Items]
Intersegment revenues	(1,188)	(4,953)
Earnings (loss) before income taxes	(1,664)	(1,389)
Domestic [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues from external customers	36,070	22,146
Intersegment revenues	462	4,085
Earnings (loss) before income taxes	2,999	1,816
International [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues from external customers	6,082	11,735
Intersegment revenues	726	868
Earnings (loss) before income taxes	$ 449	$ 1,370

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