Basis of Presentation (Details) $ in Thousands	6 Months Ended
	Mar. 28, 2020 USD ($) Segment	Oct. 01, 2019 USD ($)	Sep. 30, 2019 USD ($)	Oct. 01, 2018 USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of operating segments | Segment	2
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating Lease, Liability	$ 224,158
Operating right-of-use lease assets	$ 157,016		$ 0
Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating Lease, Liability		$ 224,000
Operating right-of-use lease assets		167,900
Cumulative Effect of New Accounting Principle in Period of Adoption		1,572
Accounting Standards Update 2016-16
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption				$ (72,261)
Accumulated Deficit | Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption		1,572
Accumulated Deficit | Accounting Standards Update 2016-16
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption				$ (72,261)
scheduling of reversal of temporary tax differences [Member] | Accumulated Deficit | Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption		$ 1,600