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Consolidated Statement of Changes in Stockholders' Equity - USD ($)
Common Stock [Member]
AOCI Attributable to Parent [Member]
Retained Earnings [Member]
Total
Balance at, Amount at Sep. 29, 2012 $ 43,011,000 $ (3,132,000) $ 435,608,000 $ 475,487,000
Balance at, Shares (in Shares) at Sep. 29, 2012 18,780,000      
Issuance of Common Stock Upon Exercise of Stock Options, Amount $ 2,905,000     2,905,000
Issuance of Common Stock Upon Exercise of Stock Options, Shares (in Shares) 80,000      
Issuance of Common Stock for Employee Stock Purchase Plan, Amount $ 1,043,000     1,043,000
Issuance of Common Stock for Employee Stock Purchase Plan, Shares (in Shares) 20,000      
Foreign Currency Translation Adjustment   (571,000)   (571,000)
Unrealized Holding Gain (Loss) on Marketable Securities   (2,227,000)   (2,227,000)
Issuance of Common Stock Under Deferred Stock Plan, Amount $ 103,000     103,000
Issuance of Common Stock Under Deferred Stock Plan, Shares (in Shares) 1,000      
Dividends Declared     (12,010,000) (12,010,000)
Share-based compensation $ 1,954,000     1,954,000
Repurchase of common stock, Amount $ (14,500,000)     $ (14,500,215)
Repurchase of common stock, Shares (in Shares) (204,000)     (204,397)
Net earnings     64,381,000 $ 64,381,000
Balance at, Amount at Sep. 28, 2013 $ 34,516,000 (5,930,000) 487,979,000 516,565,000
Balance at, Shares (in Shares) at Sep. 28, 2013 18,677,000      
Issuance of Common Stock Upon Exercise of Stock Options, Amount $ 2,227,000     2,227,000
Issuance of Common Stock Upon Exercise of Stock Options, Shares (in Shares) 52,000      
Issuance of Common Stock for Employee Stock Purchase Plan, Amount $ 1,102,000     1,102,000
Issuance of Common Stock for Employee Stock Purchase Plan, Shares (in Shares) 16,000      
Foreign Currency Translation Adjustment   (929,000)   (929,000)
Unrealized Holding Gain (Loss) on Marketable Securities   871,000   871,000
Issuance of Common Stock Under Deferred Stock Plan, Amount $ 34,000     34,000
Dividends Declared     (23,908,000) (23,908,000)
Share-based compensation 2,247,000     2,247,000
Repurchase of common stock, Amount $ (7,505,000)     $ (7,504,729)
Repurchase of common stock, Shares (in Shares) (82,000)     (81,685)
Net earnings     71,814,000 $ 71,814,000
Balance at, Amount at Sep. 27, 2014 $ 32,621,000 (5,988,000) 535,885,000 $ 562,518,000
Balance at, Shares (in Shares) at Sep. 27, 2014 18,663,000     18,663,000
Issuance of Common Stock Upon Exercise of Stock Options, Amount $ 3,489,000     $ 3,489,000
Issuance of Common Stock Upon Exercise of Stock Options, Shares (in Shares) 72,000      
Issuance of Common Stock for Employee Stock Purchase Plan, Amount $ 1,174,000     1,174,000
Issuance of Common Stock for Employee Stock Purchase Plan, Shares (in Shares) 14,000      
Foreign Currency Translation Adjustment   (5,389,000)   (5,389,000)
Unrealized Holding Gain (Loss) on Marketable Securities   480,000   480,000
Issuance of Common Stock Under Deferred Stock Plan, Amount $ 21,000     21,000
Dividends Declared     (26,905,000) (26,905,000)
Share-based compensation 2,359,000     2,359,000
Repurchase of common stock, Amount $ (8,011,000)     $ (8,011,118)
Repurchase of common stock, Shares (in Shares) (73,000)     (72,698)
Net earnings     70,183,000 $ 70,183,000
Balance at, Amount at Sep. 26, 2015 $ 31,653,000 $ (10,897,000) $ 579,163,000 $ 599,919,000
Balance at, Shares (in Shares) at Sep. 26, 2015 18,676,000     18,676,000