Stockholders Equity (detail) - USD ($)	6 Months Ended
	Oct. 01, 2016	Mar. 31, 2016	Sep. 26, 2015
Treasury Stock, at cost	$ 66,730,000	$ 65,709,000	$ 62,913,000
Class B Common Stock Converted To Class Aa Common [Member]
Treasury Stock, Value, Acquired, Cost Method	$ 66,000
Stock Repurchased During Period, Shares	1,837
Treasury Stock [Member]
Treasury Stock, at cost	$ 66,730,000
Shares, Issued	2,314,887
Common Stock [Member]
Treasury Stock, Value, Acquired, Cost Method	$ 955,000
Stock Repurchased During Period, Shares	31,500