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Acquisitions - Additional Information (Detail) - USD ($)
 3 Months Ended 12 Months Ended
Jan. 09, 2015
Dec. 11, 2014
May 05, 2014
Apr. 30, 2017
Jan. 31, 2017
Oct. 31, 2016
Jul. 31, 2016
Apr. 30, 2016
Jan. 31, 2016
Oct. 31, 2015
Jul. 31, 2015
Apr. 30, 2017
Apr. 30, 2016
Apr. 30, 2015
Nov. 25, 2014
Business Acquisition [Line Items]                              
Payments to acquire business, net of cash acquired                       $ 211,069,000 $ 1,220,000 $ 159,242,000  
Net sales       $ 229,186,000 $ 233,523,000 $ 233,528,000 $ 206,951,000 $ 221,117,000 $ 210,786,000 $ 143,242,000 $ 147,763,000 903,188,000 [1] $ 722,908,000 [1] $ 551,862,000 [1]  
DRP Acquisition                              
Business Acquisition [Line Items]                              
Payments to acquire business, excluding working capital adjustment     $ 22,800,000                        
Working capital adjustment     1,000,000                        
Payments to acquire business, net of cash acquired     $ 23,800,000                        
Battenfeld Acquisition Company Inc                              
Business Acquisition [Line Items]                              
Payments to acquire business, excluding working capital adjustment   $ 130,500,000                          
Working capital adjustment   3,100,000                          
Acquisition payment made through line of credit   100,000,000                          
Battenfeld Acquisition Company Inc | Amended Unsecured Revolving Credit Facility                              
Business Acquisition [Line Items]                              
Line of credit facility, maximum borrowing capacity                             $ 125,000,000
B T I Acquisition Excluding Hooyman LLC                              
Business Acquisition [Line Items]                              
Payments to acquire business, net of cash acquired   $ 133,600,000                          
Hooyman LLC                              
Business Acquisition [Line Items]                              
Payments to acquire business, net of cash acquired $ 1,900,000                            
BTI Acquisition                              
Business Acquisition [Line Items]                              
Payments to acquire business, net of cash acquired                       135,500,000      
Taylor Brands, LLC, Crimson Trace Corporation and Ultimate Survival Technologies, Inc.                              
Business Acquisition [Line Items]                              
Payments to acquire business, net of cash acquired                       211,100,000      
Business combination, acquisition-related costs                       3,800,000      
Net sales                       61,100,000      
Ultimate Survival Technologies, Inc.                              
Business Acquisition [Line Items]                              
Contingent consideration payable upon financial performance of acquired business       1,700,000               $ 1,700,000      
Business combination, contingent consideration payable performance period                       2 years      
Business combination contingent consideration liability current       900,000               $ 900,000      
Ultimate Survival Technologies, Inc. | Maximum                              
Business Acquisition [Line Items]                              
Contingent consideration payable upon financial performance of acquired business       $ 2,000,000               2,000,000      
Taylor Brands, LLC and Crimson Trace Corporation                              
Business Acquisition [Line Items]                              
Business combination decrease in goodwill                       $ 141,000      
[1] For the years ended April 30, 2017 and 2016, 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. For the year ended April 30, 2015, segment information herein has been restated from that previously presented to allocate corporate overhead expenses on the same basis. Corporate overhead expenses were not previously allocated for the year ended April 30, 2015 due to the timing of the BTI Acquisition.