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Treasury Stock - Additional Information (Detail) - USD ($)
 3 Months Ended 6 Months Ended
Oct. 01, 2018
Sep. 30, 2018
Sep. 30, 2018
Mar. 31, 2018
Feb. 28, 2017
Class of Stock [Line Items]          
Number of shares of common stock authorized to repurchase   36,000,000 36,000,000   1,000,000
Treasury stock, value   $ 442,291,000 $ 442,291,000 $ 430,989,000  
Treasury stock, shares   35,081,057 35,081,057 34,881,079  
Average price per share of common stock   $ 58.58 $ 56.52    
Common stock, shares outstanding   18,826,375 18,826,375 18,912,907  
Number of shares of common stock repurchased   133,425 199,978    
Treasury stock, value, acquired, cost method   $ 7,800,000 $ 11,300,000    
Nineteen Ninety Six Share Repurchase Program [Member]          
Class of Stock [Line Items]          
Common stock equals to percentage of outstanding common stock     65.00%    
Average price per share of common stock     $ 12.61    
Subsequent Event [Member]          
Class of Stock [Line Items]          
Average price per share of common stock $ 56.56        
Number of shares of common stock repurchased 81,308        
Treasury stock, value, acquired, cost method $ 4,599,000