Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Balance at the beginning of the year (in shares) at Sep. 29, 2018		17,856
Balance at the beginning of the year at Sep. 29, 2018	$ 477,932	$ 4,464	$ 171,407	$ 300,585	$ 1,476
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total comprehensive income (loss)	18,567			24,661	(6,094)
Exercise of stock options (in shares)		3
Exercise of stock options	144	$ 1	143
Stock-based compensation (in shares)		33
Stock-based compensation	5,219	$ 8	5,211
Issuance for employee stock purchase plan (in shares)		16
Issuance for employee stock purchase plan	557	$ 4	553
Common stock purchased and retired (in shares)		(8)
Common stock purchased and retired	(398)	$ (2)	(396)
Dividends	(10,740)			(10,740)
Balance at the end of the year (in shares) at Mar. 30, 2019		17,900
Balance at the end of the year at Mar. 30, 2019	485,054	$ 4,475	176,918	308,279	(4,618)
Balance at the beginning of the year (in shares) at Dec. 29, 2018		17,872
Balance at the beginning of the year at Dec. 29, 2018	473,335	$ 4,468	173,065	299,493	(3,691)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total comprehensive income (loss)	13,233			14,160	(927)
Exercise of stock options (in shares)		3
Exercise of stock options	106	$ 1	105
Stock-based compensation (in shares)		10
Stock-based compensation	3,239	$ 2	3,237
Issuance for employee stock purchase plan (in shares)		16
Issuance for employee stock purchase plan	557	$ 4	553
Common stock purchased and retired (in shares)		(1)
Common stock purchased and retired	(42)		(42)
Dividends	(5,374)			(5,374)
Balance at the end of the year (in shares) at Mar. 30, 2019		17,900
Balance at the end of the year at Mar. 30, 2019	485,054	$ 4,475	176,918	308,279	(4,618)
Balance at the beginning of the year (in shares) at Sep. 28, 2019		19,124
Balance at the beginning of the year at Sep. 28, 2019	484,059	$ 4,781	182,422	315,329	(18,473)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total comprehensive income (loss)	3,983			4,235	(252)
Exercise of stock options (in shares)		1
Exercise of stock options	41		41
Stock-based compensation (in shares)		67
Stock-based compensation	5,387	$ 17	5,370
Issuance for employee stock purchase plan (in shares)		15
Issuance for employee stock purchase plan	590	$ 4	586
Common stock purchased and retired (in shares)		(19)
Common stock purchased and retired	(873)	$ (5)	(868)
Dividends	(11,509)			(11,509)
Balance at the end of the year (in shares) at Mar. 28, 2020		19,188
Balance at the end of the year at Mar. 28, 2020	481,678	$ 4,797	187,551	308,055	(18,725)
Balance at the beginning of the year (in shares) at Dec. 28, 2019		19,156
Balance at the beginning of the year at Dec. 28, 2019	488,748	$ 4,789	183,948	314,887	(14,876)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total comprehensive income (loss)	(4,920)			(1,071)	(3,849)
Stock-based compensation (in shares)		18
Stock-based compensation	3,059	$ 5	3,054
Issuance for employee stock purchase plan (in shares)		15
Issuance for employee stock purchase plan	590	$ 4	586
Common stock purchased and retired (in shares)		(1)
Common stock purchased and retired	(38)	$ (1)	(37)
Dividends	(5,761)			(5,761)
Balance at the end of the year (in shares) at Mar. 28, 2020		19,188
Balance at the end of the year at Mar. 28, 2020	$ 481,678	$ 4,797	$ 187,551	$ 308,055	$ (18,725)