CONSOLIDATED CONDENSED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Treasury Stock	Retained Earnings	Accumulated Other Comprehensive Loss
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of accounting changes	$ 534			$ 534
Beginning balance at Sep. 29, 2018	880,207	$ 519,244	$ (248,664)	613,529	$ (3,902)
Beginning balance (shares) at Sep. 29, 2018		67,143
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of stock for services rendered (shares)		8
Issuance of stock for services rendered	195	$ 195
Repurchase of common stock (shares)		(1,233)
Repurchase of common stock	(25,485)		(25,485)
Issuance of shares for market-based restricted stock and time-based restricted stock (shares)		642
Issuance of shares for equity-based compensation	0
Equity-based compensation	3,678	$ 3,678
Cash dividend declared	(8,055)			(8,055)
Net income	7,517			7,517
Other comprehensive income	(182)				(182)
Total comprehensive income	7,335			7,517	(182)
Ending balance (shares) at Dec. 29, 2018		66,560
Ending balance at Dec. 29, 2018	858,409	$ 523,117	(274,149)	613,525	(4,084)
Beginning balance at Sep. 29, 2018	880,207	$ 519,244	(248,664)	613,529	(3,902)
Beginning balance (shares) at Sep. 29, 2018		67,143
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	5,249
Other comprehensive income	(235)
Total comprehensive income	5,014
Ending balance (shares) at Jun. 29, 2019		63,837
Ending balance at Jun. 29, 2019	787,435	$ 530,016	(334,248)	595,803	(4,136)
Beginning balance at Dec. 29, 2018	858,409	$ 523,117	(274,149)	613,525	(4,084)
Beginning balance (shares) at Dec. 29, 2018		66,560
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of stock for services rendered (shares)		10
Issuance of stock for services rendered	195	$ 195
Repurchase of common stock (shares)		(1,225)
Repurchase of common stock	(26,922)		(26,922)
Issuance of shares for market-based restricted stock and time-based restricted stock (shares)		4
Issuance of shares for equity-based compensation	0
Equity-based compensation	3,107	$ 3,107
Cash dividend declared	(8,057)			(8,057)
Net income	(3,555)			(3,555)
Other comprehensive income	37				37
Total comprehensive income	(3,518)			(3,555)	37
Ending balance (shares) at Mar. 30, 2019		65,349
Ending balance at Mar. 30, 2019	823,214	$ 526,419	(301,071)	601,913	(4,047)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of stock for services rendered (shares)		10
Issuance of stock for services rendered	222	$ 222
Repurchase of common stock (shares)		(1,538)
Repurchase of common stock	(33,177)		(33,177)
Issuance of shares for market-based restricted stock and time-based restricted stock (shares)		16
Issuance of shares for equity-based compensation	0
Equity-based compensation	3,375	$ 3,375
Cash dividend declared				(7,397)
Net income	1,287			1,287
Other comprehensive income	(89)				(89)
Total comprehensive income	1,198			1,287	(89)
Ending balance (shares) at Jun. 29, 2019		63,837
Ending balance at Jun. 29, 2019	787,435	$ 530,016	(334,248)	595,803	(4,136)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of accounting changes	(769)			(769)
Beginning balance at Sep. 28, 2019	769,063	$ 533,590	(349,212)	594,625	(9,940)
Beginning balance (shares) at Sep. 28, 2019		63,173
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of stock for services rendered (shares)		9
Issuance of stock for services rendered	222	$ 131	91
Repurchase of common stock (shares)		(224)
Repurchase of common stock	(5,369)		(5,369)
Issuance of shares for market-based restricted stock and time-based restricted stock (shares)		800
Stock Issued During Period, Value, Treasury Stock Reissued		$ (7,653)	7,653
Issuance of shares for equity-based compensation	0
Equity-based compensation	3,387	$ 3,387
Cash dividend declared	(7,651)			(7,651)
Net income	13,477			13,477
Other comprehensive income	3,293				3,293
Total comprehensive income	16,770			13,477	3,293
Ending balance (shares) at Dec. 28, 2019		63,758
Ending balance at Dec. 28, 2019	775,653	$ 529,455	(346,837)	599,682	(6,647)
Beginning balance at Sep. 28, 2019	$ 769,063	$ 533,590	(349,212)	594,625	(9,940)
Beginning balance (shares) at Sep. 28, 2019		63,173
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Repurchase of common stock (shares)	(2,100)
Repurchase of common stock	$ (46,200)
Net income	36,516
Other comprehensive income	2,666
Total comprehensive income	39,182
Ending balance (shares) at Jun. 27, 2020		61,925
Ending balance at Jun. 27, 2020	749,644	$ 536,487	(387,302)	607,733	(7,274)
Beginning balance at Dec. 28, 2019	775,653	$ 529,455	(346,837)	599,682	(6,647)
Beginning balance (shares) at Dec. 28, 2019		63,758
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of stock for services rendered (shares)		8
Issuance of stock for services rendered	221	$ 142	79
Repurchase of common stock (shares)		(872)
Repurchase of common stock	(18,522)		(18,522)
Issuance of shares for market-based restricted stock and time-based restricted stock (shares)		19
Stock Issued During Period, Value, Treasury Stock Reissued		$ (185)	185
Issuance of shares for equity-based compensation	0
Equity-based compensation	3,500	$ 3,500
Cash dividend declared	(7,557)			(7,557)
Net income	11,888			11,888
Other comprehensive income	(2,785)				(2,785)
Total comprehensive income	9,103			11,888	(2,785)
Ending balance (shares) at Mar. 28, 2020		62,913
Ending balance at Mar. 28, 2020	762,398	$ 532,912	(365,095)	604,013	(9,432)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of stock for services rendered (shares)		9
Issuance of stock for services rendered	$ 186	$ 102	84
Repurchase of common stock (shares)	(1,000)	(1,004)
Repurchase of common stock	$ (22,358)		(22,358)
Issuance of shares for market-based restricted stock and time-based restricted stock (shares)		7
Stock Issued During Period, Value, Treasury Stock Reissued		$ (67)	67
Issuance of shares for equity-based compensation	0
Equity-based compensation	3,540	$ 3,540
Cash dividend declared	(7,431)			(7,431)
Net income	11,151			11,151
Other comprehensive income	2,158				2,158
Total comprehensive income	13,309			11,151	2,158
Ending balance (shares) at Jun. 27, 2020		61,925
Ending balance at Jun. 27, 2020	$ 749,644	$ 536,487	$ (387,302)	$ 607,733	$ (7,274)