Stockholders Equity (detail) - USD ($)	Dec. 31, 2016	Mar. 31, 2016	Dec. 26, 2015
Treasury Stock, at cost	$ 67,550,000	$ 65,709,000	$ 63,358,000
Class B Common Stock Converted To Class Aa Common [Member]
Treasury Stock, at cost	$ 324,000
Shares, Issued	9,042
Treasury Stock [Member]
Treasury Stock, at cost	$ 67,550,000
Shares, Issued	2,336,792
Common Stock [Member]
Treasury Stock, at cost	$ 1,518,000
Shares, Issued	46,200