CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Treasury Stock	Retained earnings	Accumulated Other Comprehensive (loss) / income
Beginning Balance at Oct. 01, 2016	$ 799,524	$ 498,676	$ (139,407)	$ 442,981	$ (2,726)
Beginning Balance, shares at Oct. 01, 2016		70,420,000
Issuance of stock for services rendered	750	$ 750
Treasury Stock, Shares, Acquired			(945,000)
Issuance of stock for services rendered, shares		45,000
Repurchase of common stock	(18,197)		$ (18,197)
Exercise of stock options	509	$ 509
Exercise of stock options, shares		61,000
Issuance of shares for equity-based compensation	0	$ 0
Issuance of shares for market-based restricted stock and time-based restricted stock, shares		616,000
Excess tax benefits from stock based compensation	(4,392)	$ (4,392)
Equity-based compensation expense	10,972	10,972
Components of comprehensive income:
Net income	126,099			126,099
Other comprehensive loss	4,765
Comprehensive income	130,864			126,099	4,765
Ending Balance at Sep. 30, 2017	920,030	$ 506,515	$ (157,604)	569,080	2,039
Ending Balance, shares at Sep. 30, 2017		70,197,000
Cumulative effect of accounting changes		$ 1,414		4,006
Issuance of stock for services rendered	780	$ 780
Treasury Stock, Shares, Acquired			(3,760,000)
Issuance of stock for services rendered, shares		33,000
Repurchase of common stock	(91,060)		$ (91,060)
Exercise of stock options	55	$ 55
Exercise of stock options, shares		6,000
Issuance of shares for equity-based compensation	0	$ 0
Issuance of shares for market-based restricted stock and time-based restricted stock, shares		667,000
Equity-based compensation expense	10,480	$ 10,480
Cash dividend declared	(16,233)			(16,233)
Components of comprehensive income:
Net income	56,676			56,676
Other comprehensive loss	(5,941)
Comprehensive income	50,735			56,676	(5,941)
Ending Balance at Sep. 29, 2018	880,207	$ 519,244	$ (248,664)	613,529	(3,902)
Ending Balance, shares at Sep. 29, 2018		67,143,000
Cumulative effect of accounting changes	534	$ 0		534
Issuance of stock for services rendered	$ 834	$ 834
Treasury Stock, Shares, Acquired	(4,700,000)		(4,676,000)
Issuance of stock for services rendered, shares		37,000
Repurchase of common stock	$ (100,548)		$ (100,548)
Exercise of stock options	14	$ 14
Exercise of stock options, shares		2,000
Issuance of shares for equity-based compensation	0	$ 0
Issuance of shares for market-based restricted stock and time-based restricted stock, shares		667,000
Equity-based compensation expense	13,498	$ 13,498
Cash dividend declared	(31,091)			(31,091)
Components of comprehensive income:
Net income	11,653			11,653
Other comprehensive loss	(6,038)
Comprehensive income	5,615			11,653	(6,038)
Ending Balance at Sep. 28, 2019	$ 769,063	$ 533,590	$ (349,212)	$ 594,625	$ (9,940)
Ending Balance, shares at Sep. 28, 2019		63,173,000