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Basis of Presentation (Details) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2018 USD ($) Segment | Dec. 30, 2017 Segment | Apr. 01, 2017 USD ($) | Sep. 30, 2017 Segment | Oct. 01, 2017 USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |  |  |
Number of operating segments | Segment | 2 | 2 |  | 3 |
Accounting Standards Update 2016-09 [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Windfall Tax Deductions Not Yet Recognized |  |  |  |  | $ 37.0
Windfall Tax Deductions Not Yet Recognized Offset Valuation Allowance |  |  |  |  | 36.9
Excess Tax Benefit from Share-based Compensation, Operating Activities |  |  | $ 0.1 |  |
Excess tax benefits realized from stock-based awards |  |  | $ 0.1 |  |
forfeiture adjustment |  |  |  |  | $ 0.7
Accounting Standards Update 2016-16 [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Deferred Tax Assets, Other | $ 77.0 |  |  |  |

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