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Commitments and Contingencies (Details) $ in Millions |  |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Mar. 28, 2019 USD ($) | Oct. 15, 2018 USD ($) | Sep. 30, 2015 store | Dec. 31, 2018 memeber | Mar. 31, 2019 store
Loss Contingencies [Line Items] |  |  |  |  |
Guarantor Obligations, Number of Leases |  |  |  |  | 80
Loss Contingency, Number Of Locations With Subpoena For Documents |  |  | 8 |  |
Loss Contingency, Audit Methodology Sample Size | memeber |  |  |  | 200 |
Provider Proceedings [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Loss Contingency, Damages Awarded, Value | $ | $ 86 | $ 150 |  |  |

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