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Segment Information - Segment Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Jul. 31, 2017	Jul. 31, 2016
Segment Reporting Information [Line Items]
Revenues from external customers	$ 33,881	$ 37,279
Earnings (loss) before income taxes	1,797	2,100
Corporate [Member]
Segment Reporting Information [Line Items]
Intersegment revenues	(4,953)	(2,001)
Earnings (loss) before income taxes	(1,389)	(1,290)
Domestic [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues from external customers	22,146	29,637
Intersegment revenues	4,085	866
Earnings (loss) before income taxes	1,816	2,573
International [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues from external customers	11,735	7,642
Intersegment revenues	868	1,135
Earnings (loss) before income taxes	$ 1,370	$ 817

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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.

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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
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-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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