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Long-Lived Assets, Excluding Financial Instruments and Tax Assets, Classified by Controlling Countries over Ten Percent (Detail) (USD $) In Thousands, unless otherwise specified | Apr. 30, 2014 | Apr. 30, 2013 | Apr. 30, 2012
--- | --- | --- | ---
Segment Reporting Information [Line Items] |  |  |  |  |  |
Long-lived assets | $ 60,434 | [1] | $ 53,628 | [1] | $ 49,808 | [1]
UNITED STATES |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Long-lived assets | 47,411 | [2] | 40,200 | [2] | 33,559 | [2]
Other Countries |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Long-lived assets | $ 13,023 |  | $ 13,428 |  | $ 16,249 |
[1] | As of the end of the fiscal year.
[2] | Includes Corporate long-lived assets

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- Definition Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph a -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 7 + Details
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