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Future estimated recall costs.

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Insurance maximum coverage per incident.

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Amount of expense under a cooperative advertising arrangement.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of an intangible asset (excluding goodwill) to fair value.

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The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

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- Definition

The total expense recognized in the period for promotion, public relations, and brand or product advertising.

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of increase (decrease) in the standard and extended product warranty accrual from changes in estimates attributable to preexisting product warranties.

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The expense charged against earnings for the period pertaining to standard and extended warranties on the entity's goods and services granted to customers.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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Percentage of fair value of reporting unit in excess of carrying amount.

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Significant Accounting Policies - Additional Information (Detail)	3 Months Ended	12 Months Ended
	Apr. 30, 2017 USD ($)	Apr. 30, 2017 USD ($) Segment	Apr. 30, 2016 USD ($)	Apr. 30, 2015 USD ($) shares
Product Information [Line Items]
Maximum maturity period of all highly liquid investments to be considered cash equivalents		3 months
Number of reportable segments \| Segment		2
Long-lived assets impairment charges		$ 0	$ 0	$ 0
Intangible assets impairment charges		0	0	0
Goodwill	$ 169,017,000	169,017,000	76,357,000	75,426,000
Remaining cost related to recalls and safety alerts costs		1,500,000
Reduction in warranty accrual for recalls		2,437,000
Warranty expense		1,300,000	2,500,000	4,300,000
Promotional programs amount		37,300,000	20,700,000	6,900,000
Selling and marketing expenses		21,300,000	6,500,000	$ 2,800,000
Self Insurance
Product Information [Line Items]
Maximum amount of self-insurance per occurrence	10,000,000	10,000,000
Thompson/Center Arms
Product Information [Line Items]
Remaining cost related to recalls and safety alerts costs		$ 708,000
Reduction in warranty accrual for recalls	2,400,000
2011 ESPP
Product Information [Line Items]
Number of common stock issuable with antidilutive effect \| shares				73,546
Outdoor Products & Accessories Segment
Product Information [Line Items]
Number of reportable segments \| Segment		1
Number of operating segments \| Segment		2
Goodwill	155,247,000	$ 155,247,000	62,587,000	$ 61,656,000
Firearms Segment
Product Information [Line Items]
Number of reportable segments \| Segment		1
Number of operating segments \| Segment		1
Goodwill	13,770,000	$ 13,770,000	$ 13,770,000	$ 13,770,000
Goodwill impairment		0
Accessories
Product Information [Line Items]
Goodwill	$ 109,900,000	$ 109,900,000
Percentage of fair value in excess of carrying value of goodwill	16.00%	16.00%
Goodwill impairment		$ 0
Electro-Optics
Product Information [Line Items]
Goodwill	$ 45,300,000	$ 45,300,000
Percentage of fair value in excess of carrying value of goodwill	11.00%	11.00%
Goodwill impairment		$ 0
Other Capitalized Property Plant and Equipment \| Maximum
Product Information [Line Items]
Estimated useful life		10 years
Customer One \| Sales, net
Product Information [Line Items]
Concentration of risk, percentage		10.00%	10.00%	10.00%
Customer One \| Accounts Receivable
Product Information [Line Items]
Concentration of risk, percentage		17.50%	10.00%	10.00%
5.000% Senior Notes due 2018
Product Information [Line Items]
Debt instrument, interest rate	5.00%	5.00%		5.00%