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Segment Information - Segment Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2017	Jan. 31, 2016
Segment Reporting Information [Line Items]
Revenues from external customers	$ 30,371	$ 32,410	$ 103,979	$ 94,536
Earnings (loss) before income taxes	491	1,073	4,920	3,760
Corporate [Member]
Segment Reporting Information [Line Items]
Intersegment revenues	(882)	(1,617)	(6,717)	(3,336)
Earnings (loss) before income taxes	(1,015)	(1,215)	(3,670)	(3,588)
Domestic Operations [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues from external customers	25,313	25,423	83,161	76,017
Intersegment revenues	344	1,196	3,781	1,642
Earnings (loss) before income taxes	563	1,586	5,580	5,346
International Operations [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues from external customers	5,058	6,987	20,818	18,519
Intersegment revenues	538	421	2,936	1,694
Earnings (loss) before income taxes	$ 943	$ 702	$ 3,010	$ 2,002

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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

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04(15))
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04(8))
-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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-Section S99
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-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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