Stock-Based Compensation (Stock-Based Compensation Expense By Type Of Award) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 30, 2017
Share-based Payment Arrangement [Abstract]
Employee stock options	$ 2,415	$ 1,849	$ 1,588
Employee stock purchase plan	321	283	298
Restricted stock units and performance restricted stock units	6,694	5,112	3,737
Amounts capitalized as inventory	(2,875)	(1,799)	(1,444)
Amounts recognized in income for amounts previously capitalized as inventory	2,842	1,838	1,421
Total stock-based compensation included in income from operations	9,397	7,283	5,600
Income tax benefit on stock-based compensation	(1,978)	(1,763)	(1,893)
Net stock-based compensation expense included in net income	$ 7,419	$ 5,520	$ 3,707