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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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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

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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)
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