Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands		Total	Common stock	Additional paid-in capital	Treasury stock	Retained earnings	Accumulated other comprehensive (loss) income
Beginning of period (in shares) at Oct. 01, 2016			33,457,000
Exercise of stock options and vesting of other stock awards			662,000
Treasury shares purchased (in shares)			(655,000)
End of period (in shares) at Sep. 30, 2017			33,464,000
Beginning of period at Oct. 01, 2016		$ 916,797	$ 513	$ 530,647	$ (539,968)	$ 937,144	$ (11,539)
Exercise of stock options and vesting of other stock awards			6
Stock-based compensation expense				17,411
Exercise of stock options and vesting of other stock awards, including tax benefits				7,239
Treasury shares purchased					(34,136)
Net income		112,062				112,062
Other comprehensive (loss) income		6,560					6,560
End of period at Sep. 30, 2017		$ 1,025,939	$ 519	555,297	(574,104)	1,049,206	(4,979)
Exercise of stock options and vesting of other stock awards			633,000
Treasury shares purchased (in shares)			(2,259,000)
End of period (in shares) at Sep. 29, 2018		31,838,000	31,838,000
Exercise of stock options and vesting of other stock awards			$ 7
Stock-based compensation expense				17,981
Exercise of stock options and vesting of other stock awards, including tax benefits				8,210
Treasury shares purchased					(137,034)
Net income		$ 13,040				13,040
Other comprehensive (loss) income		(7,000)					(7,000)
End of period at Sep. 29, 2018		$ 921,143	$ 526	581,488	(711,138)	1,062,246	(11,979)
Cumulative effect adjustment for adoption of new accounting pronouncement	[1]					7,815
Exercise of stock options and vesting of other stock awards			350,000
Treasury shares purchased (in shares)			(3,184,000)
End of period (in shares) at Sep. 28, 2019		29,004,000	29,004,000
Exercise of stock options and vesting of other stock awards			$ 3
Stock-based compensation expense				21,335
Exercise of stock options and vesting of other stock awards, including tax benefits				(5,422)
Treasury shares purchased					(182,109)
Net income		$ 108,616				108,616
Other comprehensive (loss) income		(5,805)					(5,805)
End of period at Sep. 28, 2019		$ 865,576	$ 529	$ 597,401	$ (893,247)	$ 1,178,677	$ (17,784)

[1] See Note 1, "Description of Business and Significant Accounting Policies," for a discussion of recently adopted accounting pronouncements.