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 at Sep. 29, 2017		$ 503	$ 72,801	$ 166,905	$ (2,198)	$ 4,993
Balance, beginning of period (shares) at Sep. 29, 2017		9,996,199
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income				235
Dividends declared				(989)
Award of non-vested shares			(164)		164
Award of non-vested shares (shares)		6,532
Stock-based compensation			508
Currency translation adjustment						(276)
Change in pension plans, net of tax (of $44, $44, $12, $33, $33, and $7, respectively)						139
Purchase of treasury stock at cost					(675)
Purchase of treasury stock at cost (shares)		(9,377)
Balance, end of period at Dec. 29, 2017		$ 503	73,145	166,151	(2,709)	4,856
Balance, end of period (shares) at Dec. 29, 2017		9,993,354
Balance, beginning of period at Sep. 29, 2017		$ 503	72,801	166,905	(2,198)	4,993
Balance, beginning of period (shares) at Sep. 29, 2017		9,996,199
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 45,625
Currency translation adjustment	(2,213)
Balance, end of period at Jun. 29, 2018	282,060	$ 503	74,229	209,169	(2,646)	805
Balance, end of period (shares) at Jun. 29, 2018		9,997,421
Balance, beginning of period at Dec. 29, 2017		$ 503	73,145	166,151	(2,709)	4,856
Balance, beginning of period (shares) at Dec. 29, 2017		9,993,354
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income				21,620
Dividends declared				(1,187)
Issuance of stock under employee stock purchase plan			68
Issuance of stock under employee stock purchase plan (shares)		1,740
Award of non-vested shares			(63)		63
Award of non-vested shares (shares)		2,327
Stock-based compensation			506
Currency translation adjustment						505
Write off of currency translation adjustment						(2,351)
Change in pension plans, net of tax (of $44, $44, $12, $33, $33, and $7, respectively)						138
Balance, end of period at Mar. 30, 2018		$ 503	73,656	186,584	(2,646)	3,148
Balance, end of period (shares) at Mar. 30, 2018		9,997,421
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	23,770			23,770
Dividends declared				(1,185)
Stock-based compensation			573
Currency translation adjustment	(2,442)					(2,442)
Write off of currency translation adjustment						61
Change in pension plans, net of tax (of $44, $44, $12, $33, $33, and $7, respectively)						38
Balance, end of period at Jun. 29, 2018	282,060	$ 503	74,229	209,169	(2,646)	805
Balance, end of period (shares) at Jun. 29, 2018		9,997,421
Balance, beginning of period at Sep. 28, 2018	279,197	$ 503	75,025	202,828	(2,646)	3,487
Balance, beginning of period (shares) at Sep. 28, 2018		9,999,046
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 (of $44, $44, $12, $33, $33, and $7, respectively)						105
Purchase of treasury stock at cost					(708)
Purchase of treasury stock at cost (shares)		(9,890)
Balance, end of period at Dec. 28, 2018		$ 503	73,968	204,965	(1,761)	1,892
Balance, end of period (shares) at Dec. 28, 2018		10,037,392
Balance, beginning of period at Sep. 28, 2018	279,197	$ 503	75,025	202,828	(2,646)	3,487
Balance, beginning of period (shares) at Sep. 28, 2018		9,999,046
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	47,510
Currency translation adjustment	(801)
Balance, end of period at Jun. 28, 2019	322,972	$ 504	75,192	246,164	(1,761)	2,873
Balance, end of period (shares) at Jun. 28, 2019		10,050,061
Balance, beginning of period at Dec. 28, 2018		$ 503	73,968	204,965	(1,761)	1,892
Balance, beginning of period (shares) at Dec. 28, 2018		10,037,392
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income				21,923
Dividends declared				(1,397)
Issuance of stock under employee stock purchase plan			79
Issuance of stock under employee stock purchase plan (shares)		1,594
Award of non-vested shares (shares)		11,075
Stock-based compensation			572
Currency translation adjustment						(148)
Change in pension plans, net of tax (of $44, $44, $12, $33, $33, and $7, respectively)						105
Balance, end of period at Mar. 29, 2019		$ 503	74,619	225,491	(1,761)	1,849
Balance, end of period (shares) at Mar. 29, 2019		10,050,061
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	22,066			22,066
Dividends declared				(1,393)
Award of non-vested shares		$ 1	(1)
Award of non-vested shares (shares)		0
Stock-based compensation			574
Currency translation adjustment	1,047					1,047
Change in pension plans, net of tax (of $44, $44, $12, $33, $33, and $7, respectively)						(23)
Balance, end of period at Jun. 28, 2019	$ 322,972	$ 504	$ 75,192	$ 246,164	$ (1,761)	$ 2,873
Balance, end of period (shares) at Jun. 28, 2019		10,050,061