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Segment Information - Segment Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2017	Oct. 31, 2016
Segment Reporting Information [Line Items]
Revenues from external customers	$ 41,471	$ 36,329	$ 75,352	$ 73,608
Earnings (loss) before income taxes	2,743	2,329	4,540	4,429
Corporate / Eliminations [Member]
Segment Reporting Information [Line Items]
Intersegment revenues	(6,130)	(3,834)	(11,083)	(5,835)
Earnings (loss) before income taxes	(1,488)	(1,365)	(2,877)	(2,655)
Domestic [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues from external customers	28,540	28,211	50,686	57,848
Intersegment revenues	5,068	2,571	9,153	3,437
Earnings (loss) before income taxes	2,945	2,444	4,761	5,017
International [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues from external customers	12,931	8,118	24,666	15,760
Intersegment revenues	1,062	1,263	1,930	2,398
Earnings (loss) before income taxes	$ 1,286	$ 1,250	$ 2,656	$ 2,067

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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

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-Name Accounting Standards Codification
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-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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-Topic 225
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