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Operating Segment Information (Details) (USD $)
In Thousands, unless otherwise specified
1 Months Ended 3 Months Ended 9 Months Ended
Jan. 31, 2012
Jan. 01, 2012
segment
Oct. 02, 2011
Jul. 03, 2011
Jan. 02, 2011
Jan. 01, 2012
segment
Jan. 02, 2011
Apr. 01, 2012
Operating Segment Information                
Number of operating segments   4       4   3
Results by operating segment                
Sales to external customers   $ 1,117,484     $ 1,129,290 $ 3,302,157 $ 3,540,676  
Total sales   1,117,484     1,129,290 3,302,157 3,540,676  
Total income before interest, income taxes, and noncontrolling interest   105,424     126,428 383,371 393,839  
Changes related to preexisting warranties 7,805 7,614 (1,706) (352)        
Increase in litigation reserve under the tentative agreement 25,500              
Aerospace Systems
               
Results by operating segment                
External sales generated by operating segment (as a percent)           30.00%    
Sales to external customers   301,843     321,288 988,148 1,067,020  
Intercompany sales   4,216     3,073 11,671 9,032  
Total income before interest, income taxes, and noncontrolling interest   34,839     23,935 115,060 98,499  
Reduction in sales and profit, resulting from increased costs         25,000      
Armament Systems
               
Results by operating segment                
External sales generated by operating segment (as a percent)           33.00%    
External sales generated from military small-caliber ammunition contract (as a percent)           15.00% 15.00%  
Sales to external customers   403,654     431,493 1,108,771 1,313,046  
Intercompany sales   30,280     21,585 107,542 74,931  
Total income before interest, income taxes, and noncontrolling interest   67,048     55,049 190,415 158,185  
Missile Products
               
Results by operating segment                
External sales generated by operating segment (as a percent)           15.00%    
Sales to external customers   168,926     167,875 484,261 483,693  
Intercompany sales   34,006     24,862 93,354 82,605  
Total income before interest, income taxes, and noncontrolling interest   23,515     19,389 61,532 47,689  
Security and Sporting
               
Results by operating segment                
External sales generated by operating segment (as a percent)           22.00%    
Sales to external customers   243,061     208,634 720,977 676,917  
Intercompany sales   5,632     3,561 16,207 7,776  
Total income before interest, income taxes, and noncontrolling interest   22,787     30,537 75,436 95,623  
Intercompany transaction
               
Results by operating segment                
Intercompany sales   (74,134)     (53,081) (228,774) (174,344)  
Total income before interest, income taxes, and noncontrolling interest   8,738     5,582 24,370 16,224  
Corporate
               
Results by operating segment                
Total income before interest, income taxes, and noncontrolling interest   $ (42,765)     $ (2,302) $ (59,072) $ (6,157)