Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 25, 2021	Jun. 26, 2020	Jun. 25, 2021	Jun. 26, 2020
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance, Beginning Of Period	$ (4,039)	$ (31,615)	$ (10,594)	$ (20,625)
Unrealized Gains (Losses)	(4,505)	4,000	(9,022)	(1,837)
Income Tax Effect - Benefit/(Expense)	49	(296)	(337)	(226)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(3,519)	11,956	(782)	(188)
Realized (Gains) - Investment Securities	2,766	2,908	6,989	4,339
Income Tax Effect - (Benefit)/Expense	(240)	(370)	(645)	(647)
Net Of Tax	2,526	2,538	6,344	3,692
Net current-period other comprehensive income/(loss)	(993)	14,494	5,562	3,504
Balance, End Of Period	(5,032)	(17,121)	(5,032)	(17,121)
Unrealized Gains/Losses On Available-For-Sale Securities [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance, Beginning Of Period	458	1,309	818	2,198
Unrealized Gains (Losses)	(212)	(820)	(819)	(2,894)
Income Tax Effect - Benefit/(Expense)	44	(186)	100	(116)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(168)	(1,006)	(719)	(3,010)
Realized (Gains) - Investment Securities	8	1,854	209	3,246
Income Tax Effect - (Benefit)/Expense	(2)	(370)	(12)	(647)
Net Of Tax	6	1,484	197	2,599
Net current-period other comprehensive income/(loss)	(162)	478	(522)	(411)
Balance, End Of Period	296	1,787	296	1,787
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance, Beginning Of Period	3,751	(3,724)	3,969	0
Unrealized Gains (Losses)	(4,293)	4,820	(8,203)	1,057
Income Tax Effect - Benefit/(Expense)	115	(110)	180	(110)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(4,178)	4,710	(8,023)	947
Realized (Gains) - Investment Securities	2,758	1,054	6,780	1,093
Income Tax Effect - (Benefit)/Expense	(238)	0	(633)
Net Of Tax	2,520	1,054	6,147	1,093
Net current-period other comprehensive income/(loss)	(1,658)	5,764	(1,876)	2,040
Balance, End Of Period	2,093	2,040	2,093	2,040
Foreign Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance, Beginning Of Period	(8,248)	(29,200)	(15,381)	(22,823)
Unrealized Gains (Losses)	937	8,252	8,577	1,875
Income Tax Effect - Benefit/(Expense)	(110)	0	(617)	0
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	827	8,252	7,960	1,875
Net current-period other comprehensive income/(loss)	827	8,252	7,960	1,875
Balance, End Of Period	$ (7,421)	$ (20,948)	$ (7,421)	$ (20,948)