Note L - Share-based Compensation - Outstanding Stock Options (Details) - USD ($) $ / shares in Units, $ in Thousands		6 Months Ended	12 Months Ended
		Sep. 24, 2017	Mar. 26, 2016	[1]
Options outstanding, beginning balance (in shares)	[1]	75,745
Options outstanding, weighted average exercise price, beginning balance (in dollars per share)	[1]	$ 35.58
Options outstanding, weighted average remaining contractual life, beginning balance (Year)		1 year 313 days	2 years 131 days
Options outstanding, aggregate intrinsic value, beginning balance		$ 2,306	$ 1,899
Options granted (in shares)		0
Granted, weighted average exercise price (in dollars per share)		$ 0
Granted, aggregate intrinsic value (in dollars per share)		$ 0
Options expired (in shares)		0
Expired, weighted average exercise price (in dollars per share)		$ 0
Expired, aggregate intrinsic value (in dollars per share)		$ 0
Options exercised (in shares)		(11,361)
Exercised, weighted average exercise price (in dollars per share)		$ 35.58
Options exercised, aggregate intrinsic value		$ 379
Options outstanding, ending balance (in shares)		64,384
Options outstanding, weighted average exercise price, ending balance (in dollars per share)		$ 35.58
Options exercisable (in shares)		45,444
Options exercisable, weighted average exercise price (in dollars per share)		$ 35.58
Options exercisable, weighted average remaining contractual life (Year)		1 year 313 days
Options exercisable, aggregate intrinsic value		$ 1,628

[1] Represents outstanding options after giving effect to the replacement options issued in connection with the Company's special dividend.