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Segment Information - Segment Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2018	Jan. 31, 2017
Segment Reporting Information [Line Items]
Revenues from external customers	$ 38,190	$ 30,371	$ 113,542	$ 103,979
Earnings (loss) before income taxes	2,484	491	7,024	4,920
Corporate / Eliminations [Member]
Segment Reporting Information [Line Items]
Intersegment revenues	(2,506)	(882)	(13,589)	(6,717)
Earnings (loss) before income taxes	(1,838)	(1,015)	(4,715)	(3,670)
Domestic [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues from external customers	29,734	25,313	80,420	83,161
Intersegment revenues	1,145	344	10,298	3,781
Earnings (loss) before income taxes	2,959	563	7,720	5,580
International [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues from external customers	8,456	5,058	33,122	20,818
Intersegment revenues	1,361	538	3,291	2,936
Earnings (loss) before income taxes	$ 1,363	$ 943	$ 4,019	$ 3,010

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 940
-SubTopic 20
-Section 25
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=68072869&loc=d3e41242-110953

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(10))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

Reference 4: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 944
-SubTopic 225
-Section S99
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

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-Name Accounting Standards Codification
-Topic 225
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