Consolidated Statements of Shareholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Treasury Stock	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Beginning balance (in shares) at Sep. 27, 2014		33,653
Beginning balance at Sep. 27, 2014	$ 781,133	$ 500	$ 475,634	$ (479,968)	$ 766,385	$ 18,582
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	94,332				94,332
Other comprehensive income (loss)	(25,053)					(25,053)
Treasury shares purchased (in shares)		(745)
Treasury shares purchased	(30,000)			(30,000)
Share-based compensation expense	13,252		13,252
Exercise of stock options, including tax benefits (in shares)		592
Exercise of stock options, including tax benefits	8,608	$ 6	8,602
Ending balance (in shares) at Oct. 03, 2015		33,500
Ending balance at Oct. 03, 2015	842,272	$ 506	497,488	(509,968)	860,717	(6,471)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	76,427				76,427
Other comprehensive income (loss)	(5,068)					(5,068)
Treasury shares purchased (in shares)		(761)
Treasury shares purchased	(30,000)			(30,000)
Share-based compensation expense	19,341		19,341
Exercise of stock options, including tax benefits (in shares)		718
Exercise of stock options, including tax benefits	$ 13,825	$ 7	13,818
Ending balance (in shares) at Oct. 01, 2016	33,457	33,457
Ending balance at Oct. 01, 2016	$ 916,797	$ 513	530,647	(539,968)	937,144	(11,539)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	112,062				112,062
Other comprehensive income (loss)	6,560					6,560
Treasury shares purchased (in shares)		(655)
Treasury shares purchased	(34,136)			(34,136)
Share-based compensation expense	17,411		17,411
Exercise of stock options, including tax benefits (in shares)		662
Exercise of stock options, including tax benefits	$ 7,245	$ 6	7,239
Ending balance (in shares) at Sep. 30, 2017	33,464	33,464
Ending balance at Sep. 30, 2017	$ 1,025,939	$ 519	$ 555,297	$ (574,104)	$ 1,049,206	$ (4,979)