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Acquisitions - Identifiable Intangible Assets Acquired and Respective Weighted Average Lives (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Apr. 30, 2017 | Apr. 30, 2016
Acquired Finite Lived Intangible Assets [Line Items] |  |
Total intangible assets, gross | $ 179,759 | $ 81,499
Weighted Average Life (In years) | 5 years |
Developed technology |  |
Acquired Finite Lived Intangible Assets [Line Items] |  |
Total intangible assets, gross | $ 19,430 | 16,430
Weighted Average Life (In years) | 6 years |
Customer relationships |  |
Acquired Finite Lived Intangible Assets [Line Items] |  |
Total intangible assets, gross | $ 105,260 | $ 28,560
Weighted Average Life (In years) | 5 years |
Order backlog |  |
Acquired Finite Lived Intangible Assets [Line Items] |  |
Total intangible assets, gross | $ 1,150 |
Taylor Brands, LLC, Crimson Trace Corporation and Ultimate Survival Technologies, Inc. |  |
Acquired Finite Lived Intangible Assets [Line Items] |  |
Total intangible assets, gross | 97,850 |
Taylor Brands, LLC, Crimson Trace Corporation and Ultimate Survival Technologies, Inc. | Developed technology |  |
Acquired Finite Lived Intangible Assets [Line Items] |  |
Total intangible assets, gross | $ 3,000 |
Weighted Average Life (In years) | 4 years 1 month 6 days |
Taylor Brands, LLC, Crimson Trace Corporation and Ultimate Survival Technologies, Inc. | Customer relationships |  |
Acquired Finite Lived Intangible Assets [Line Items] |  |
Total intangible assets, gross | $ 76,600 |
Weighted Average Life (In years) | 5 years 1 month 6 days |
Taylor Brands, LLC, Crimson Trace Corporation and Ultimate Survival Technologies, Inc. | Trade names |  |
Acquired Finite Lived Intangible Assets [Line Items] |  |
Total intangible assets, gross | $ 17,000 |
Weighted Average Life (In years) | 4 years 9 months 18 days |
Taylor Brands, LLC, Crimson Trace Corporation and Ultimate Survival Technologies, Inc. | Order backlog |  |
Acquired Finite Lived Intangible Assets [Line Items] |  |
Total intangible assets, gross | $ 1,150 |
Weighted Average Life (In years) | 3 months 18 days |
Taylor Brands, LLC, Crimson Trace Corporation and Ultimate Survival Technologies, Inc. | Non-competition agreement |  |
Acquired Finite Lived Intangible Assets [Line Items] |  |
Total intangible assets, gross | $ 100 |
Weighted Average Life (In years) | 3 years 4 months 24 days |

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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