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Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($)
$ in Thousands
Common Stock Including Additional Paid in Capital [Member]
AOCI Attributable to Parent [Member]
Retained Earnings [Member]
Total
Balance (in shares) at Sep. 30, 2017 18,663,000      
Balance at Sep. 30, 2017 $ 17,382 $ (8,875) $ 673,815 $ 682,322
Issuance of common stock upon exercise of stock options (in shares) 5,000      
Issuance of common stock upon exercise of stock options $ 253 253
Foreign currency translation adjustments (3,887) (3,887)
Dividends declared (8,400) (8,400)
Share-based compensation 952 952
Repurchase of common stock
Net Earnings 36,249 36,249
Issuance of common stock under deferred stock plan 2 2
Share-based compensation $ 952 952
Balance (in shares) at Dec. 30, 2017 18,668,000      
Balance at Dec. 30, 2017 $ 18,589 (12,872) 701,664 707,381
Unrealized holding gain on marketable securities (110) (110)
Balance (in shares) at Sep. 30, 2017 18,663,000      
Balance at Sep. 30, 2017 $ 17,382 (8,875) 673,815 682,322
Foreign currency translation adjustments       (1,989)
Net Earnings       54,082
Balance (in shares) at Mar. 31, 2018 18,697,000      
Balance at Mar. 31, 2018 $ 22,256 (11,158) 711,084 722,182
Balance (in shares) at Dec. 30, 2017 18,668,000      
Balance at Dec. 30, 2017 $ 18,589 (12,872) 701,664 707,381
Issuance of common stock upon exercise of stock options (in shares) 21,000      
Issuance of common stock upon exercise of stock options $ 1,951 1,951
Foreign currency translation adjustments 1,898 1,898
Dividends declared (8,413) (8,413)
Share-based compensation 868 868
Repurchase of common stock
Net Earnings 17,833 17,833
Issuance of common stock for employee stock purchase plan (in shares) 7,000      
Issuance of common stock for employee stock purchase plan $ 756 756
Issuance of common stock under deferred stock plan (in shares) 1,000      
Issuance of common stock under deferred stock plan $ 92 92
Share-based compensation $ 868 868
Balance (in shares) at Mar. 31, 2018 18,697,000      
Balance at Mar. 31, 2018 $ 22,256 (11,158) 711,084 722,182
Unrealized holding gain on marketable securities (184) $ (184)
Balance (in shares) at Sep. 29, 2018 18,754,000     18,754,000
Balance at Sep. 29, 2018 $ 27,340 (11,994) 743,745 $ 759,091
Issuance of common stock upon exercise of stock options (in shares) 20,000      
Issuance of common stock upon exercise of stock options $ 1,704 1,704
Foreign currency translation adjustments (1,359) (1,359)
Dividends declared (9,389) (9,389)
Share-based compensation 972 972
Repurchase of common stock
Net Earnings 17,526 17,526
Share-based compensation $ 972 972
Balance (in shares) at Dec. 29, 2018 18,774,000      
Balance at Dec. 29, 2018 $ 30,016 (13,438) 751,967 $ 768,545
Balance (in shares) at Sep. 29, 2018 18,754,000     18,754,000
Balance at Sep. 29, 2018 $ 27,340 (11,994) 743,745 $ 759,091
Foreign currency translation adjustments       (965)
Net Earnings       $ 37,880
Balance (in shares) at Mar. 30, 2019 18,815,000     18,815,000
Balance at Mar. 30, 2019 $ 35,243 (13,044) 762,916 $ 785,115
Reclass from accumulated other comprehensive gain | Accounting Standards Update 2016-01 [Member] (85) 85
Balance (in shares) at Dec. 29, 2018 18,774,000      
Balance at Dec. 29, 2018 $ 30,016 (13,438) 751,967 768,545
Issuance of common stock upon exercise of stock options (in shares) 34,000      
Issuance of common stock upon exercise of stock options $ 3,451 3,451
Foreign currency translation adjustments 394 394
Dividends declared (9,405) (9,405)
Share-based compensation 914 914
Repurchase of common stock
Net Earnings 20,354 20,354
Issuance of common stock for employee stock purchase plan (in shares) 6,000      
Issuance of common stock for employee stock purchase plan $ 772 772
Issuance of common stock under deferred stock plan (in shares) 1,000      
Issuance of common stock under deferred stock plan $ 90 90
Share-based compensation $ 914 $ 914
Balance (in shares) at Mar. 30, 2019 18,815,000     18,815,000
Balance at Mar. 30, 2019 $ 35,243 $ (13,044) $ 762,916 $ 785,115