Shareholders' Equity (Details) - USD ($) $ in Thousands		3 Months Ended						6 Months Ended		9 Months Ended
		Jun. 29, 2019		Mar. 30, 2019	Jun. 30, 2018		Mar. 31, 2018	Jun. 29, 2019	Jun. 30, 2018	Sep. 29, 2018	Sep. 30, 2017
Changes In Components Of OCI [Line Items]
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment and Other		$ 16,021			$ (146,807)			$ 20,463	$ (101,838)
Document Period End Date								Jun. 29, 2019
Derivatives used in Net Investment Hedge, Net of Tax, Period Increase (Decrease)		(1,427)			0			$ 4,106	0
Other Comprehensive Income, Unrealized Gain on Derivatives Arising During Period, Net		(6,606)			231			(6,366)	459
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax		(85)			(613)			(404)	(895)
Cumulative Effect on Retained Earnings, Net of Tax							$ 0
Net change in Accumulated other comprehensive income (loss)		7,558			(144,304)			18,740	(120,926)
Other comprehensive income before reclassifications [Member]
Changes In Components Of OCI [Line Items]
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment and Other	[1]	15,560			(146,203)			20,836	(99,803)
Derivatives used in Net Investment Hedge, Net of Tax, Period Increase (Decrease)		224			0
Other Comprehensive Income (Loss) Unrealized gain (loss) on investment securities, net								6,816	0
Other Comprehensive Income, Unrealized Gain on Derivatives Arising During Period, Net				$ (6,849)	0					$ (6,849)	$ 0
Other comprehensive income before reclassifications [Member] | Intra-entity foreign currency transactions [Member]
Changes In Components Of OCI [Line Items]
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment and Other		9,079			14,774			780	2,850
Reclassification out of Accumulated Other Comprehensive Income [Member]
Changes In Components Of OCI [Line Items]
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment and Other		(54)			1,055			(240)	(123)
Derivatives used in Net Investment Hedge, Net of Tax, Period Increase (Decrease)		(1,651)			0
Other Comprehensive Income (Loss) Unrealized gain (loss) on investment securities, net								(2,710)	0
Other Comprehensive Income, Unrealized Gain on Derivatives Arising During Period, Net		243			231			483	459
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax		85			613			(404)	(895)
Cumulative impact of newly adopted accounting standard updates [Member]
Changes In Components Of OCI [Line Items]
Cumulative Effect on Retained Earnings, Net of Tax		$ 0	[2]		$ 0	[2]		$ 0	$ (22,354)

[1] Includes intra-entity foreign currency transactions that are of a long-term investment nature of $9,079 and $780 for the second quarter and first six months of 2019 and $14,774 and $2,850 for the second quarter and first six months 2018, respectively.

[2] Amounts relate to unrealized gains and losses on investments and stranded tax effects reclassified from “Accumulated other comprehensive income” to “Retained earnings” in accordance with ASU No. 2018-02 and ASU No. 2016-01.