Treasury Stock and Subsequent Event - Additional Information (Detail) - USD ($)		3 Months Ended	6 Months Ended
	Oct. 01, 2016	Sep. 30, 2016	Sep. 30, 2016	Mar. 31, 2016	Nov. 30, 2015	Oct. 31, 2015
Class of Stock [Line Items]
Number of shares of common stock authorized to repurchase		35,000,000	35,000,000		1,000,000	34,000,000
Treasury stock, value		$ 396,002,000	$ 396,002,000	$ 391,803,000
Treasury stock, shares		33,988,013	33,988,013	33,886,259
Average price per share of common stock		$ 40.12	$ 41.27
Common stock, shares outstanding		19,552,218	19,552,218	19,562,413
Number of shares of common stock repurchased		63,594	101,754
Treasury Stock, Value, Acquired, Cost Method		$ 2,600,000	$ 4,200,000
Subsequent Event [Member]
Class of Stock [Line Items]
Average price per share of common stock	$ 35.51
Number of shares of common stock repurchased	61,880
Treasury Stock, Value, Acquired, Cost Method	$ 2,197,000
Nineteen Ninety Six Share Repurchase Program [Member]
Class of Stock [Line Items]
Common stock equals to percentage of outstanding common stock			63.00%
Average price per share of common stock			$ 11.65