Note L - Share-based Compensation - Outstanding Stock Options (Details) - USD ($) $ / shares in Units, $ in Thousands		9 Months Ended		12 Months Ended
		Dec. 24, 2017		Mar. 26, 2016	[1]	Dec. 23, 2017	[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 222 days	[2]	2 years 131 days
Options outstanding, aggregate intrinsic value, beginning balance		$ 3,093	[2]			$ 1,899
Options granted (in shares)		0
Granted, weighted average exercise price (in dollars per share)		$ 0
Replacement options issued (in shares)	[2]	68,498
Replacement options issued, weighted average exercise price (in dollars per share)	[2]	$ 33.438
Replacement options issued, weighted average remaining contractual life (Year)	[2]	1 year 222 days
Replacement options issued, aggregate intrinsic value	[2]	$ 3,093
Options expired (in shares)		0
Expired, weighted average exercise price (in dollars per share)		$ 0
Cancellation of outstanding options (in shares)	[2]	(64,384)
Cancellation of outstanding options, weighted average exercise price (in dollars per share)	[2]	$ 35.58
Cancellation of outstanding options, weighted average remaining contractual life (Year)	[2]	1 year 222 days
Cancellation of outstanding options, aggregate intrinsic value	[2]	$ 3,093
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)	[2]	68,498
Options outstanding, weighted average exercise price, ending balance (in dollars per share)	[2]	$ 33.438
Options exercisable (in shares)	[2]	48,348
Options exercisable, weighted average exercise price (in dollars per share)	[2]	$ 33.438
Options exercisable, weighted average remaining contractual life (Year)	[2]	1 year 222 days
Options exercisable, aggregate intrinsic value	[2]	$ 2,183

[1] Represents outstanding options after giving effect to the replacement options issued in connection with the Company's special March 2015 dividend.

[2] Represents the effects on outstanding options after giving effect to the replacement options issued in connection with the Company's special dividend to shareholders of record on December 22, 2017.