Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands		Total	Common stock	Additional paid-in capital	Treasury stock	Retained earnings	Accumulated other comprehensive (loss) income
Cumulative effect adjustment for adoption of new accounting pronouncement	[1]					$ 7,815
Beginning of period (in shares) at Sep. 29, 2018			31,838,000
Exercise of stock options and vesting of other stock awards (in shares)			265,000
Treasury shares purchased (in shares)			(1,862,000)
End of period (in shares) at Mar. 30, 2019			30,241,000
Beginning of period at Sep. 29, 2018		$ 921,143	$ 526	$ 581,488	$ (711,138)	1,062,246	$ (11,979)
Exercise of stock options and vesting of other stock awards			2
Stock-based compensation expense				9,929
Exercise of stock options and vesting of other stock awards, including tax benefits				(5,138)
Treasury shares purchased					(106,297)
Net income		46,984				46,984
Other comprehensive income (loss)		1,006					1,006
End of period at Mar. 30, 2019		875,444	$ 528	586,279	(817,435)	1,117,045	(10,973)
Beginning of period (in shares) at Dec. 29, 2018			30,992,000
Exercise of stock options and vesting of other stock awards (in shares)			241,000
Treasury shares purchased (in shares)			(992,000)
End of period (in shares) at Mar. 30, 2019			30,241,000
Beginning of period at Dec. 29, 2018		905,163	$ 526	587,011	(761,189)	1,092,287	(13,472)
Exercise of stock options and vesting of other stock awards			2
Stock-based compensation expense				5,176
Exercise of stock options and vesting of other stock awards, including tax benefits				(5,908)
Treasury shares purchased					(56,246)
Net income		24,758				24,758
Other comprehensive income (loss)		2,499					2,499
End of period at Mar. 30, 2019		$ 875,444	$ 528	586,279	(817,435)	1,117,045	(10,973)
Cumulative effect adjustment for adoption of new accounting pronouncement	[1]					(1,077)
Beginning of period (in shares) at Sep. 28, 2019		29,004,000	29,004,000
Exercise of stock options and vesting of other stock awards (in shares)			498,000
Treasury shares purchased (in shares)			(316,000)
End of period (in shares) at Apr. 04, 2020		29,186,000	29,186,000
Beginning of period at Sep. 28, 2019		$ 865,576	$ 529	597,401	(893,247)	1,178,677	(17,784)
Exercise of stock options and vesting of other stock awards			5
Stock-based compensation expense				10,825
Exercise of stock options and vesting of other stock awards, including tax benefits				(780)
Treasury shares purchased					(19,484)
Net income		43,932				43,932
Other comprehensive income (loss)		(6,439)					(6,439)
End of period at Apr. 04, 2020		$ 892,558	$ 534	607,446	(912,731)	1,221,532	(24,223)
Beginning of period (in shares) at Jan. 04, 2020			29,222,000
Exercise of stock options and vesting of other stock awards (in shares)			189,000
Treasury shares purchased (in shares)			(225,000)
End of period (in shares) at Apr. 04, 2020		29,186,000	29,186,000
Beginning of period at Jan. 04, 2020		$ 908,372	$ 532	609,168	(899,577)	1,208,606	(10,357)
Exercise of stock options and vesting of other stock awards			2
Stock-based compensation expense				5,779
Exercise of stock options and vesting of other stock awards, including tax benefits				(7,501)
Treasury shares purchased					(13,154)
Net income		12,926				12,926
Other comprehensive income (loss)		(13,866)					(13,866)
End of period at Apr. 04, 2020		$ 892,558	$ 534	$ 607,446	$ (912,731)	$ 1,221,532	$ (24,223)

[1] See Note 1, "Basis of Presentation," for a discussion of recently adopted accounting pronouncements.