Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands		Total	Common stock	Additional paid-in capital	Treasury stock	Retained earnings	Retained earnings Cumulative Effect, Period of Adoption, Adjustment	Accumulated other comprehensive loss
Beginning of period (in shares) at Sep. 30, 2017			33,464,000
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
Beginning 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			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 income (loss)		(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 pronouncements (1)	[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 income (loss)		(5,805)						(5,805)
End of period at Sep. 28, 2019		$ 865,576	$ 529	597,401	(893,247)	1,178,677		(17,784)
Cumulative effect adjustment for adoption of new accounting pronouncements (1)	[1]						$ (1,077)
Exercise of stock options and vesting of other stock awards			608,000
Treasury shares purchased (in shares)			(610,000)
End of period (in shares) at Oct. 03, 2020		29,002,000	29,002,000
Exercise of stock options and vesting of other stock awards			$ 6
Stock-based compensation expense				24,280
Exercise of stock options and vesting of other stock awards, including tax benefits				(117)
Treasury shares purchased					(41,392)
Net income		$ 117,479				117,479
Other comprehensive income (loss)		12,725						12,725
End of period at Oct. 03, 2020		$ 977,480	$ 535	$ 621,564	$ (934,639)	$ 1,295,079		$ (5,059)

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