Note M - Stockholders' Equity, Stock Plans and Other Employee Benefit Plans (Details Textual)																12 Months Ended						101 Months Ended	198 Months Ended
		Jun. 08, 2018 $ / shares	May 31, 2018 $ / shares	Jan. 04, 2018 USD ($)	Dec. 22, 2017 $ / shares shares	Dec. 20, 2017 $ / shares	Nov. 01, 2017 USD ($) $ / shares	Aug. 04, 2016 USD ($)	Jun. 01, 2016 USD ($)	Jun. 10, 2015 USD ($) $ / shares shares	Mar. 29, 2015 $ / shares shares	Mar. 27, 2015 USD ($) $ / shares	Mar. 10, 2015 $ / shares	Jun. 04, 2013 USD ($) $ / shares shares	Nov. 01, 2012 USD ($) shares	Mar. 31, 2019 USD ($)	Mar. 25, 2018 USD ($) $ / shares shares	Mar. 26, 2017 USD ($) $ / shares shares	Mar. 27, 2016 USD ($) $ / shares shares	Mar. 29, 2015 $ / shares shares	Mar. 30, 2014 USD ($) $ / shares shares	Mar. 25, 2018 USD ($) $ / shares shares	Mar. 25, 2018 USD ($) $ / shares shares	Sep. 09, 2016 $ / shares shares	Mar. 11, 2016 $ / shares shares	Feb. 01, 2016 shares	Jun. 05, 2013 $ / shares shares	Sep. 13, 2012 shares	Feb. 01, 2011 shares	Sep. 14, 2010 shares	Nov. 09, 2009 shares	May 31, 2007 USD ($)
Common Stock, Dividends, Per Share, Declared | $ / shares							$ 5
Payments of Ordinary Dividends, Common Stock | $				$ 20,923,000													$ 21,073,000	$ 375,000	$ 375,000
Increased Number of Shares Available for Issuance Due to Plan Amendment | shares																												250,000
Amount of Available Common Shares Reduced by Each Share of Restricted Stock Granted | shares																												3.2
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period																				4 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | shares																				50,000
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | $ / shares																				$ 53.89
Share Based Compensation Arrangement by Share Based Payment Award Option Life																				5 years
Share Price | $ / shares						$ 83.20						$ 73.56
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense | $																	$ 144,000	$ 213,000	$ 298,000
Share Based Compensation Total Unamortized Compensation Expense | $																	$ 100,000					$ 100,000	$ 100,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period | shares	[1]																64,384
Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price | $ / shares	[1]																$ 35.58
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period | shares																	11,361	48,285	15,147
Proceeds from Stock Options Exercised | $																	$ 0	$ 44,000	$ 89,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value | $																	$ 379,000	1,555,000	486,000
Minimum Percentage of Common Stock Acquired by a Person or Group which Triggers Exercise of New Rights																											15.00%
New Right Purchase Price | $ / shares																											$ 100
Common Stock, Capital Shares Reserved for Future Issuance | shares																											10,188,600
Treasury Stock, Shares, Acquired | shares																	0						5,127,373
Treasury Stock, Value, Acquired, Cost Method | $																		$ 1,272,000	19,231,000				$ 77,303,000
Common Stock, Par or Stated Value Per Share | $ / shares																	$ 0.01	$ 0.01				$ 0.01	$ 0.01	$ 0.01
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased | shares																	260,258					260,258	260,258
Number of Times of Salary and Bonus Lump Sum Cash Payment																	2.99					2.99	2.99
Defined Contribution Plan, Employer Discretionary Contribution Amount | $																	$ 40,000	$ 41,000	35,000
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent																	20.00%
Defined Contribution Plan, Employer Matching Contribution Rate Per Dollar																	0.25
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay																	3.00%
Multiemployer Plans, Withdrawal Obligation | $																	$ 441,000					$ 441,000	$ 441,000
Multiemployer Plans, Plan Contributions | $																	$ 12,000	10,000	8,000
Executive Chairman of the Board [Member]
Term of Consulting Period Pursuant to the Lorber Employment [Agreement]															0 years
President and Chief Operating Officer [Member]
Share Price | $ / shares										$ 40.28
Common Stock, Par or Stated Value Per Share | $ / shares										$ 0.01
Consulting Fee Per Month | $								$ 8,100		$ 16,300
Transition Agreement, Severance Payable | $										$ 289,000
Transition Agreement, Number of Shares of Common Stock Purchased | shares										56,933
Base Salary [Member] | Executive Chairman of the Board [Member]
Contractual Obligation, Total | $															$ 600,000
Base Salary [Member] | Chief Executive Officer [Member]
Defined Contribution Plan, Employer Discretionary Contribution Amount | $									$ 500,000
Base Salary [Member] | One Employee [Member]
Contractual Obligation, Total | $																																$ 136,000
Consulting Fee [Member] | Executive Chairman of the Board [Member]
Contractual Obligation, Total | $															$ 200,000
Sixth Stock Repurchase Plan [Member]
Treasury Stock, Shares, Acquired | shares																						939,742
Treasury Stock, Value, Acquired, Cost Method | $																						$ 29,641,000
Stock Repurchase Program, Number of Shares Authorized to be Repurchased | shares																									1,200,000						500,000
Stock Repurchase Program Number of Additional Shares Authorized to be Repurchased | shares																									200,000	200,000			300,000
MSI Agreement [Member]
Stock Repurchase Program, Number of Shares Authorized to be Repurchased | shares																								100,000	175,000
Common Stock, Par or Stated Value Per Share | $ / shares																									$ 0.01
Newly Authorized Additional Shares Pursuant to 2010 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | shares																														150,000
Shares Expired or Forfeited up to 100000 Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | shares																														100,000
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | shares																	219,584					219,584	219,584
Employee Stock Option [Member] | The 2010 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | shares					68,498						75,745
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | $ / shares					$ 33.438						$ 35.58
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period | shares					64,384						50,000
Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price | $ / shares					$ 35.58						$ 53.89
Employee Stock Option [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period																	5 years
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period																	3 years
Employee Stock Option [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period																	10 years
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period																	5 years
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | shares																	188,933					188,933	188,933
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period																					5 years
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | shares																					25,000
Share Price | $ / shares																					$ 49.80
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition																					5 years
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total | $																					$ 1,245,000
Restricted Stock [Member] | Executive Chairman of the Board [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | shares															50,000
Restricted Stock [Member] | Chief Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | shares														25,000
Share Price | $ / shares														$ 49.80
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition														5 years
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total | $														$ 1,245,000
Common Stock Purchase Rights [Member]
Common Stock, Capital Shares Reserved for Future Issuance | shares																	6,210,307					6,210,307	6,210,307
Excluding Dividend [Member]
Share Price | $ / shares						78.20						48.56
Dividends on Unvested Restricted Stock [Member]
Dividends Payable | $							$ 25,000
Special Cash Dividend [Member]
Common Stock, Dividends, Per Share, Declared | $ / shares						$ 5						$ 25	$ 25
Payments of Ordinary Dividends, Common Stock | $												$ 115,100,000					$ 875,000
Dividends Payable | $												$ 1,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value | $																	$ 321,000	$ 736,000	$ 683,000
Special Cash Dividend [Member] | Scenario, Forecast [Member]
Payments of Ordinary Dividends, Common Stock | $																$ 125,000
Subsequent Event [Member]
Common Stock, Dividends, Amount per Annum | $ / shares			$ 1
Common Stock, Dividends, Amount per Quarter | $ / shares			$ 0.25
Common Stock, Dividends, Per Share, Declared | $ / shares		$ 0.25

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