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Acquisitions - Identifiable Intangible Assets Acquired and Respective Weighted Average Lives (Detail) - USD ($) $ in Thousands		12 Months Ended
		Apr. 30, 2018	Apr. 30, 2017
Acquired Finite Lived Intangible Assets [Line Items]
Total intangible assets, gross		$ 172,213	$ 179,759
Weighted Average Life (In years)		5 years
Developed technology
Acquired Finite Lived Intangible Assets [Line Items]
Total intangible assets, gross		$ 21,130	19,430
Weighted Average Life (In years)		6 years
Customer relationships
Acquired Finite Lived Intangible Assets [Line Items]
Total intangible assets, gross	[1]	$ 92,360	105,260
Weighted Average Life (In years)		5 years
Order backlog
Acquired Finite Lived Intangible Assets [Line Items]
Total intangible assets, gross		$ 1,150	$ 1,150
Gemini Technologies, Incorporated and Bubba Blade Branded Products from Fish Tales, LLC
Acquired Finite Lived Intangible Assets [Line Items]
Total intangible assets, gross		6,400
Gemini Technologies, Incorporated and Bubba Blade Branded Products from Fish Tales, LLC | Developed technology
Acquired Finite Lived Intangible Assets [Line Items]
Total intangible assets, gross		$ 1,700
Weighted Average Life (In years)		5 years 10 months 24 days
Gemini Technologies, Incorporated and Bubba Blade Branded Products from Fish Tales, LLC | Customer relationships
Acquired Finite Lived Intangible Assets [Line Items]
Total intangible assets, gross		$ 1,600
Weighted Average Life (In years)		5 years 2 months 12 days
Gemini Technologies, Incorporated and Bubba Blade Branded Products from Fish Tales, LLC | Trade names
Acquired Finite Lived Intangible Assets [Line Items]
Total intangible assets, gross		$ 3,100
Weighted Average Life (In years)		5 years 7 months 6 days
Taylor Brands, LLC, Crimson Trace Corporation and Ultimate Survival Technologies, Inc.
Acquired Finite Lived Intangible Assets [Line Items]
Total intangible assets, gross		$ 83,350
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		$ 62,100
Weighted Average Life (In years)		5 years
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
[1] Changes to the gross carrying amount of customer relationships is related to purchase accounting adjustments. For more information regarding the changes in valuation of customer relations, see Note 2 — Acquisitions to our consolidated financial statements.

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+ 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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-Name Accounting Standards Codification
-Topic 350
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-Paragraph 2
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