CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS’ EQUITY (unaudited) - USD ($) $ in Thousands	Total	Common Stock	Capital in Excess of Par Value	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Income (Loss)
Balance, beginning of period (shares) at Sep. 28, 2018		9,999,046
Balance, beginning of period at Sep. 28, 2018		$ 503	$ 75,025	$ 202,828	$ (2,646)	$ 3,487
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income				3,521
Dividends declared				(1,384)
Award of non-vested shares			(1,593)		1,593
Award of non-vested shares (shares)		48,236
Stock-based compensation			536
Currency translation adjustment						(1,700)
Change in pension plans, net of tax						105
Purchase of treasury stock at cost (shares)		(9,890)
Purchase of treasury stock at cost					(708)
Balance, end of period (shares) at Dec. 28, 2018		10,037,392
Balance, end of period at Dec. 28, 2018		$ 503	73,968	204,965	(1,761)	1,892
Balance, beginning of period (shares) at Sep. 28, 2018		9,999,046
Balance, beginning of period at Sep. 28, 2018		$ 503	75,025	202,828	(2,646)	3,487
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 25,444
Currency translation adjustment	(1,848)
Change in pension plans, net of tax	210
Balance, end of period (shares) at Mar. 29, 2019		10,050,061
Balance, end of period at Mar. 29, 2019	300,701	$ 503	74,619	225,491	(1,761)	1,849
Balance, beginning of period (shares) at Dec. 28, 2018		10,037,392
Balance, beginning of period at Dec. 28, 2018		$ 503	73,968	204,965	(1,761)	1,892
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	21,923			21,923
Dividends declared				(1,397)
Issuance of stock under employee stock purchase plan (shares)		1,594
Issuance of stock under employee stock purchase plan			79
Award of non-vested shares (shares)		11,075
Stock-based compensation			572
Currency translation adjustment	(148)					(148)
Change in pension plans, net of tax	105					105
Balance, end of period (shares) at Mar. 29, 2019		10,050,061
Balance, end of period at Mar. 29, 2019	300,701	$ 503	74,619	225,491	(1,761)	1,849
Balance, beginning of period (shares) at Sep. 27, 2019		10,045,771
Balance, beginning of period at Sep. 27, 2019	324,534	$ 504	75,856	248,377	(1,761)	1,558
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income				6,430
Dividends declared				(1,693)
Award of non-vested shares (shares)		31,571
Stock-based compensation			667
Currency translation adjustment						700
Change in pension plans, net of tax						61
Purchase of treasury stock at cost (shares)		(7,129)
Purchase of treasury stock at cost					(460)
Balance, end of period (shares) at Dec. 27, 2019		10,070,213
Balance, end of period at Dec. 27, 2019		$ 504	76,523	253,114	(2,221)	2,319
Balance, beginning of period (shares) at Sep. 27, 2019		10,045,771
Balance, beginning of period at Sep. 27, 2019	324,534	$ 504	75,856	248,377	(1,761)	1,558
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	26,817
Currency translation adjustment	(907)
Change in pension plans, net of tax	123
Balance, end of period (shares) at Mar. 27, 2020		10,082,609
Balance, end of period at Mar. 27, 2020	347,102	$ 504	76,237	271,808	(2,221)	774
Balance, beginning of period (shares) at Dec. 27, 2019		10,070,213
Balance, beginning of period at Dec. 27, 2019		$ 504	76,523	253,114	(2,221)	2,319
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	20,387			20,387
Dividends declared				(1,693)
Issuance of stock under employee stock purchase plan (shares)		0
Issuance of stock under employee stock purchase plan			0
Award of non-vested shares (shares)		12,396
Stock-based compensation			(286)
Currency translation adjustment	(1,607)					(1,607)
Change in pension plans, net of tax	62					62
Balance, end of period (shares) at Mar. 27, 2020		10,082,609
Balance, end of period at Mar. 27, 2020	$ 347,102	$ 504	$ 76,237	$ 271,808	$ (2,221)	$ 774