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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	$ 5,420	$ 1,414		$ 4,006
Beginning balance at Sep. 30, 2017	920,030	$ 506,515	$ (157,604)	569,080	$ 2,039
Beginning balance (shares) at Sep. 30, 2017		70,197
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of stock for services rendered (shares)		9
Issuance of stock for services rendered	195	$ 195
Repurchase of common stock (shares)		(148)
Repurchase of common stock	(3,280)		(3,280)
Exercise of stock options (shares)		6
Exercise of stock options	55	$ 55
Issuance of shares for market-based restricted stock and time-based restricted stock (shares)		540
Issuance of shares for market-based restricted stock and time-based restricted stock	0
Equity-based compensation	2,557	$ 2,557
Net income/(loss)	(69,528)			(69,528)
Other comprehensive loss	1,825				1,825
Total comprehensive income/(loss)	(67,703)			(69,528)	1,825
Ending balance (shares) at Dec. 30, 2017		70,604
Ending balance at Dec. 30, 2017	857,274	$ 510,736	(160,884)	503,558	3,864
Beginning balance at Sep. 30, 2017	920,030	$ 506,515	(157,604)	569,080	2,039
Beginning balance (shares) at Sep. 30, 2017		70,197
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income/(loss)	27,041
Other comprehensive loss	(3,178)
Total comprehensive income/(loss)	23,863
Ending balance (shares) at Jun. 30, 2018		68,006
Ending balance at Jun. 30, 2018	882,082	$ 516,208	(224,938)	591,951	(1,139)
Beginning balance at Dec. 30, 2017	857,274	$ 510,736	(160,884)	503,558	3,864
Beginning balance (shares) at Dec. 30, 2017		70,604
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)		(898)
Repurchase of common stock	(21,470)		(21,470)
Issuance of shares for market-based restricted stock and time-based restricted stock (shares)		73
Issuance of shares for market-based restricted stock and time-based restricted stock	0
Equity-based compensation	2,384	$ 2,384
Net income/(loss)	36,313			36,313
Other comprehensive loss	5,231				5,231
Total comprehensive income/(loss)	41,544			36,313	5,231
Ending balance (shares) at Mar. 31, 2018		69,787
Ending balance at Mar. 31, 2018	879,927	$ 513,315	(182,354)	539,871	9,095
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)		(1,793)
Repurchase of common stock	(42,584)		(42,584)
Issuance of shares for market-based restricted stock and time-based restricted stock (shares)		4
Issuance of shares for market-based restricted stock and time-based restricted stock	0
Equity-based compensation	2,698	$ 2,698
Net income/(loss)	60,256			60,256
Other comprehensive loss	(10,234)				(10,234)
Total comprehensive income/(loss)	50,022			60,256	(10,234)
Ending balance (shares) at Jun. 30, 2018		68,006
Ending balance at Jun. 30, 2018	882,082	$ 516,208	(224,938)	591,951	(1,139)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of accounting changes	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 market-based restricted stock and time-based restricted stock	0
Equity-based compensation	3,678	$ 3,678
Cash dividend declared	(8,055)			(8,055)
Net income/(loss)	7,517			7,517
Other comprehensive loss	(182)				(182)
Total comprehensive income/(loss)	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]
Repurchase of common stock (shares)	(4,000)
Repurchase of common stock	$ (85,600)
Net income/(loss)	5,249
Other comprehensive loss	(235)
Total comprehensive income/(loss)	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 market-based restricted stock and time-based restricted stock	0
Equity-based compensation	3,107	$ 3,107
Cash dividend declared	(8,057)			(8,057)
Net income/(loss)	(3,555)			(3,555)
Other comprehensive loss	37				37
Total comprehensive income/(loss)	(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)	(1,500)	(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 market-based restricted stock and time-based restricted stock	0
Equity-based compensation	3,375	$ 3,375
Cash dividend declared	(7,397)			(7,397)
Net income/(loss)	1,287			1,287
Other comprehensive loss	(89)				(89)
Total comprehensive income/(loss)	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)

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