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Segment Information - Segment Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 31, 2016	Oct. 31, 2015	Oct. 31, 2016	Oct. 31, 2015
Segment Reporting Information [Line Items]
Revenues from external customers	$ 36,329	$ 31,037	$ 73,608	$ 62,126
Earnings (loss) before income taxes	2,329	1,153	4,429	2,687
Corporate [Member]
Segment Reporting Information [Line Items]
Intersegment revenues	(3,834)	(912)	(5,835)	(1,719)
Earnings (loss) before income taxes	(1,365)	(1,309)	(2,655)	(2,373)
Domestic Operations [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues from external customers	28,211	26,279	57,848	50,594
Intersegment revenues	2,571	160	3,437	446
Earnings (loss) before income taxes	2,444	1,927	5,017	3,760
International Operations [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues from external customers	8,118	4,758	15,760	11,532
Intersegment revenues	1,263	752	2,398	1,273
Earnings (loss) before income taxes	$ 1,250	$ 535	$ 2,067	$ 1,300

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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
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-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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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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-Name Accounting Standards Codification
-Topic 225
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-Section S99
-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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