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Acquisitions - Additional Information (Detail) - USD ($) |  |  |  |  | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Feb. 26, 2016 | Jan. 09, 2015 | Dec. 11, 2014 | May. 05, 2014 | Jan. 31, 2016 | Jan. 31, 2015 | Apr. 30, 2015
Business Acquisition [Line Items] |  |  |  |  |  |  |
Increase in goodwill |  |  |  |  | $ 738,000 |  |
Goodwill deductible for tax purpose |  |  |  |  | 12,000,000 |  |
DRP Acquisition |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Payments to acquire business, excluding working capital adjustment |  |  |  | $ 22,800,000 |  |  |
Working capital adjustment |  |  |  | 1,000,000 |  |  |
Payments to acquire business, net of cash acquired |  |  |  | $ 23,800,000 |  |  |
Battenfeld Acquisition Company Inc |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Payments to acquire business, excluding working capital adjustment |  |  | $ 130,500,000 |  |  |  |
Working capital adjustment |  |  | 3,100,000 |  |  |  |
Payments to acquire business, net of cash acquired |  |  |  |  |  | $ 136,152,000 |
Acquisition payment made through line of credit |  |  | 100,000,000 |  |  |  |
B T I Acquisition Excluding Hooyman LLC |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Payments to acquire business, net of cash acquired |  |  | $ 133,600,000 |  |  |  |
Hooyman LLC |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Payments to acquire business, net of cash acquired |  | $ 1,900,000 |  |  |  |  |
BTI Acquisition |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Payments to acquire business, net of cash acquired |  |  |  |  | 135,500,000 |  |
Increase in goodwill |  |  |  |  | 738,000 |  |
Business combination, acquisition-related costs |  |  |  |  | $ 0 |  | $ 1,700,000
PowerTech, Inc. |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Payments to acquire business, net of cash acquired | $ 1,200,000 |  |  |  |  |  |
Business combination consideration payable upon earnout achievement | $ 275,000 |  |  |  |  |  |

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- Definition The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=34752592&loc=d3e1043-128460 + Details
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