Note N - Stockholders' Equity (Details Textual) - USD ($)			6 Months Ended		168 Months Ended
	Mar. 27, 2015	Mar. 10, 2015	Mar. 27, 2016	Sep. 27, 2015	Sep. 27, 2015	Sep. 18, 2015	Mar. 29, 2015	Sep. 11, 2014	Jun. 05, 2013
Special Cash Dividend [Member] | Scenario, Forecast [Member]
Payments of Ordinary Dividends, Common Stock			$ 250,000
Special Cash Dividend [Member]
Common Stock, Dividends, Per Share, Declared	$ 25	$ 25
Payments of Ordinary Dividends, Common Stock	$ 115,100,000			$ 125,000
Dividends Payable	$ 1,000,000
Dutch Auction Tender Offer [Member] | Minimum [Member]
Share Price						$ 33
Dutch Auction Tender Offer [Member] | Maximum [Member]
Share Price						$ 36
Dutch Auction Tender Offer [Member]
Stock Repurchase Program, Number of Shares Authorized to be Repurchased						500,000
Stock Repurchase Program, Additional Number of Shares that can Be Repurchased						88,610
Stock Repurchase Program, Percentage of Outstanding Stock that can Be Repurchased						2.00%
Payments of Ordinary Dividends, Common Stock		$ 116,100,000
Minimum Percentage of Common Stock Acquired by a Person or Group which Triggers Exercise of New Rights									15.00%
New Right Purchase Price									$ 100
Common Stock, Capital Shares Reserved for Future Issuance				12,089,641	12,089,641				10,188,600
Treasury Stock, Shares, Acquired				185,198	4,832,885
Treasury Stock, Value, Acquired, Cost Method				$ 7,214,000	$ 64,014,000
Share Price	$ 73.56
Common Stock, Par or Stated Value Per Share				$ 0.01	$ 0.01		$ 0.01	$ 0.01
Stock Repurchase Program, Authorized Amount								$ 6,000,000
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased				66,074	66,074