Basis of Presentation and Summary of Significant Accounting Policies Basis of Presentation and Summary of Significant Accounting Policies - Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands		3 Months Ended	12 Months Ended
		Mar. 29, 2019	Sep. 30, 2019		Oct. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reclassification of stranded tax benefits	[1]		$ 0
Accumulated Deficit
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reclassification of stranded tax benefits		$ 2,333	$ 2,333	[1]
Forecast | Minimum | Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease, liability					$ 42,000
Operating lease, right-of-use asset					42,000
Forecast | Maximum | Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease, liability					52,000
Operating lease, right-of-use asset					$ 52,000

[1] (1) Due to the adoption of ASU 2018-02.