Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands		12 Months Ended
		Sep. 27, 2019	Sep. 28, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance		$ (15,832)	$ (7,753)
Other Comprehensive Income (Loss), before Reclassifications, before Tax		4,955
Income tax effect - benefit/(expense)		402	106
Net of tax		(4,947)	(7,721)
Realized gains/(losses)	[1]	133	(447)
Income tax effect - benefit/(expense)	[2]	21	89
Net of tax		154	(358)
Net current-period other comprehensive income/(loss)		(4,793)	(8,079)
Ending Balance		(20,625)	(15,832)
Investment Securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance		(2,948)	(377)
Other Comprehensive Income (Loss), before Reclassifications, before Tax		5,131	(2,213)
Income tax effect - benefit/(expense)		37	0
Net of tax		5,168	(2,213)
Realized gains/(losses)	[1]	(43)	(447)
Income tax effect - benefit/(expense)	[2]	21	89
Net of tax		(22)	(358)
Net current-period other comprehensive income/(loss)		5,146	(2,571)
Ending Balance		2,198	(2,948)
Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Other Comprehensive Income (Loss), before Reclassifications, before Tax		(176)
Net of tax		(176)
Realized gains/(losses)	[1]	176
Net of tax		176
Net current-period other comprehensive income/(loss)		0
Ending Balance		0
Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance		(12,884)	(7,376)
Other Comprehensive Income (Loss), before Reclassifications, before Tax	[1]	(9,500)	(5,614)
Income tax effect - benefit/(expense)		(439)	106
Net of tax		(9,939)	(5,508)
Net current-period other comprehensive income/(loss)		(9,939)	(5,508)
Ending Balance		$ (22,823)	$ (12,884)

[1] Realized gains or losses, if any, from the sale of our AFS investment securities or from foreign currency translation adjustments are included within other income/expense, net in our consolidated statements of operations

[2] The income tax benefit or expense is included within provision for income taxes in our consolidated statements of operations.