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Purchase of Noncontrolling Interest - Additional Information (Detail) - USD ($) |  | 12 Months Ended
--- | --- | ---
Jun. 24, 2013 | Apr. 30, 2016 | Apr. 30, 2015 | Apr. 30, 2014
Noncontrolling Interest [Line Items] |  |  |  |
Reduction in retained earnings |  |  |  | $ 1,874,000
Cash paid to minority stock holders |  | $ 888,000 | $ 888,000 | 1,780,000
Retained Earnings [Member] |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |
Reduction in retained earnings |  |  |  | $ 1,874,000
Kewaunee Labway Asia Pte. Ltd. [Member] |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |
Minority ownership percentage | 49.00% | 100.00% |  |
Total purchase price of minority ownership | $ 3,555,000 |  |  |
Cash paid to minority stock holders | 1,780,000 |  |  |
Increase in other current accrued expenses | 887,500 |  |  |
Increase in other non current liabilities | 887,500 |  |  |
Kewaunee Labway Asia Pte. Ltd. [Member] | Retained Earnings [Member] |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |
Reduction in retained earnings | 1,874,000 |  |  |
Kewaunee Labway Asia Pte. Ltd. [Member] | Noncontrolling Interest [Member] |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |
Reduction in noncontrolling interest | 1,681,000 |  |  |
Kewaunee Labway Asia Pte. Ltd. [Member] | Final Installment [Member] |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |
Remaining amount to be paid to Stockholders | 887,500 |  |  |
Kewaunee Labway Asia Pte. Ltd. [Member] | Second Installment [Member] |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |
Remaining amount to be paid to Stockholders | $ 887,500 |  |  |

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- Definition Represents the purchase by the parent of an additional equity interest in a subsidiary during the period, thereby effecting a change in total (consolidated) equity attributable to the parent. The purchase of the additional equity interest represented by this element increases the parent's controlling interest in the subsidiary. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4M -URI http://asc.fasb.org/extlink&oid=35736750&loc=SL4591554-111686 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=18733093&loc=SL4573702-111684 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition Decrease in noncontrolling interest (for example, but not limited to, redeeming or purchasing the interests of noncontrolling shareholders, issuance of shares (interests) by the non-wholly owned subsidiary to the parent entity for other than cash, and a buyback of shares (interest) by the non-wholly owned subsidiary from the noncontrolling interests). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=51664549&loc=SL4569655-111683 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=51664549&loc=SL4616395-111683 + Details
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