Quarterly Financial Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended																12 Months Ended
	Apr. 30, 2019		Jan. 31, 2019		Oct. 31, 2018		Jul. 31, 2018		Apr. 30, 2018		Jan. 31, 2018		Oct. 31, 2017		Jul. 31, 2017		Apr. 30, 2019		Apr. 30, 2018		Apr. 30, 2017
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 175,733		$ 162,008		$ 161,703		$ 138,833		$ 172,026		$ 157,376		$ 148,427		$ 129,021		$ 638,277	[1]	$ 606,850	[1]	$ 903,188	[1]
Gross profit	63,364		54,059		56,386		52,422		57,404		46,917		50,799		40,632		226,231	[1]	195,752	[1]	375,272	[1]
Net (loss)/income	$ 9,825		$ (5,725)	[2]	$ 6,665		$ 7,645		$ 7,664		$ 11,395	[3]	$ 3,234		$ (2,165)		$ 18,410		$ 20,128		$ 127,854
Per common share
Basic - total	$ 0.18	[4]	$ (0.10)	[4]	$ 0.12	[4]	$ 0.14	[4]	$ 0.14	[4]	$ 0.21	[4]	$ 0.06	[4]	$ (0.04)	[4]	$ 0.34	[4]	$ 0.37	[4]	$ 2.29
Diluted - total	$ 0.18	[4]	$ (0.10)	[4]	$ 0.12	[4]	$ 0.14	[4]	$ 0.14	[4]	$ 0.21	[4]	$ 0.06	[4]	$ (0.04)	[4]	$ 0.33	[4]	$ 0.37	[4]	$ 2.25

[1] For the years ended April 30, 2019, 2018, and 2017, we allocated all of corporate overhead expenses except for interest and income taxes, such as general and administrative expenses and other corporate-level expenses, to both our Firearms and Outdoor Products & Accessories segments.

[2] Amounts includes a $10.4 million non-cash goodwill impairment relating to our Outdoor Products & Accessories segement.

[3] Amount includes an income tax benefit of approximately $9.4 million, primarily caused by the effect of Tax Reform, which resulted in the remeasurement of deferred tax assets and liabilities at lower enacted corporate federal tax rates.

[4] Basic and diluted earnings per share may not equal the sum of the quarterly basic and diluted earnings per share due to rounding.