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Legal Proceedings (Details) - USD ($) $ in Millions | May 22, 2017 | Aug. 04, 2015 | Jun. 30, 2011 | May 22, 2018
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Liability for Uncollected Sales Taxes, with Interest and Penalties | Georgia Department of Revenue |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Assessed sales tax liability | $ 2.6 | $ 96.1 | $ 73.8 |
Sparta Implied Covenant Counterclaim Loss Contingency [Member] | Subsequent Event [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Loss Contingency, Estimate of Possible Loss |  |  |  | $ 4.9

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