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. 29, 2018	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	0	0	1,704
Foreign currency translation adjustment	0	(1,359)	0	(1,359)
Dividends declared	0	0	(9,389)	(9,389)
Share-based compensation	972	0	0	972
Net earnings	0	0	17,526	17,526
Reclass from accumulated other comprehensive gain	$ 0	(85)	85	0
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. 28, 2019	18,895,000			18,895,000
Balance at Sep. 28, 2019	$ 45,744	(12,988)	800,995	$ 833,751
Issuance of common stock upon exercise of stock options (in shares)	5,000
Issuance of common stock upon exercise of stock options	$ 468	0	0	468
Foreign currency translation adjustment	0	810	0	810
Dividends declared	0	0	(10,867)	(10,867)
Share-based compensation	1,299	0	0	1,299
Net earnings	$ 0	0	17,059	$ 17,059
Balance (in shares) at Dec. 28, 2019	18,900,000			18,900,000
Balance at Dec. 28, 2019	$ 47,511	$ (12,178)	$ 807,187	$ 842,520