Segment Reporting - Additional Information (Detail) (USD $)	9 Months Ended
	Jan. 31, 2015 Segment	Apr. 30, 2014
Segment Reporting Information [Line Items]
Number of reportable segments	2
Property, plant, and equipment, net	$ 135,478,000	$ 120,440,000
Goodwill	76,067,000
Total assets	547,217,000	381,503,000
Firearms
Segment Reporting Information [Line Items]
Number of reportable segments	1
Intangible assets	3,700,000
Property, plant, and equipment, net	132,600,000
Goodwill	13,900,000
Total assets	393,200,000
Accessories
Segment Reporting Information [Line Items]
Number of reportable segments	1
Intangible assets	72,400,000
Property, plant, and equipment, net	2,900,000
Goodwill	62,100,000
Total assets	$ 154,000,000