CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Common stock [Member]	Treasury Stock [Member]	Accumulated Income (Deficit) [Member]	Accumulated Other Comprehensive Income [Member]
Beginning Balance at Sep. 28, 2013	$ 714,023	$ 467,525	$ (46,356)	$ 289,236	$ 3,618
Beginning Balance, shares at Sep. 28, 2013		75,283
Issuance of stock for services rendered	809	$ 809
Treasury Stock, Shares, Acquired			(43)
Issuance of stock for services rendered, shares		63
Repurchase of common stock	(628)		$ (628)
Exercise of stock options	1,080	$ 1,080
Exercise of stock options, shares		131
Issuance of shares for market-based restricted stock and time-based restricted stock	0	$ 0
Issuance of shares for market-based restricted stock and time-based restricted stock, shares		1,192
Excess tax benefits from stock based compensation	(825)	$ (825)
Equity-based compensation expense	10,527	10,527
Components of comprehensive income:
Net income	62,988			62,988
Translation adjustment	(983)				(983)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	0
Unamortized pension costs	(391)				(391)
Comprehensive income	61,614			62,988	(1,374)
Ending Balance at Sep. 27, 2014	786,600	$ 479,116	$ (46,984)	352,224	2,244
Ending Balance, shares at Sep. 27, 2014		76,626
Issuance of stock for services rendered	1,049	$ 1,049
Treasury Stock, Shares, Acquired			(6,405)
Issuance of stock for services rendered, shares		83
Repurchase of common stock	(77,872)		$ (77,872)
Exercise of stock options	694	$ 694
Exercise of stock options, shares		75
Issuance of shares for market-based restricted stock and time-based restricted stock	0	$ 0
Issuance of shares for market-based restricted stock and time-based restricted stock, shares		861
Excess tax benefits from stock based compensation	540	$ 540
Equity-based compensation expense	10,940	10,940
Components of comprehensive income:
Net income	50,639			50,639
Translation adjustment	(3,360)				(3,360)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	0
Unamortized pension costs	19				19
Comprehensive income	47,298			50,639	(3,341)
Ending Balance at Oct. 03, 2015	769,249	$ 492,339	$ (124,856)	402,863	(1,097)
Ending Balance, shares at Oct. 03, 2015		71,240
Issuance of stock for services rendered	551	$ 551
Treasury Stock, Shares, Acquired			(1,408)
Issuance of stock for services rendered, shares		50
Repurchase of common stock	(14,551)		$ (14,551)
Exercise of stock options	410	$ 410
Exercise of stock options, shares		53
Issuance of shares for market-based restricted stock and time-based restricted stock	0	$ 0
Issuance of shares for market-based restricted stock and time-based restricted stock, shares		485
Excess tax benefits from stock based compensation	197	$ 197
Equity-based compensation expense	5,179	5,179
Components of comprehensive income:
Net income	47,112			47,112
Translation adjustment	624				624
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	(462)				(462)
Unamortized pension costs	(1,791)				(1,791)
Comprehensive income	45,483			47,112	(1,629)
Ending Balance at Oct. 01, 2016	$ 806,518	$ 498,676	$ (139,407)	$ 449,975	$ (2,726)
Ending Balance, shares at Oct. 01, 2016		70,420