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Segment Information - Segment Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Jul. 31, 2016	Jul. 31, 2015
Segment Reporting Information [Line Items]
Revenues from external customers	$ 37,279	$ 31,089
Earnings (loss) before income taxes	2,100	1,534
Corporate [Member]
Segment Reporting Information [Line Items]
Intersegment revenues	(2,001)	(807)
Earnings (loss) before income taxes	(1,290)	(1,064)
Domestic [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues from external customers	29,637	24,315
Intersegment revenues	866	286
Earnings (loss) before income taxes	2,573	1,833
International [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues from external customers	7,642	6,774
Intersegment revenues	1,135	521
Earnings (loss) before income taxes	$ 817	$ 765

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Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

+ 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
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-Name Accounting Standards Codification
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-SubTopic 225
-Section S99
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