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Stock-based Compensation (Details) - 2015 Equity Incentive Plan [Member] - shares
6 Months Ended
Mar. 01, 2018
Jun. 30, 2018
Restricted Stock [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Equity instruments other than options, granted (in shares) 300,000.0  
Restricted Stock Units [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Equity instruments other than options, granted (in shares) 200,000.0  
Period from public disclosure in 2016 of financial results for fiscal year 2015 to vesting date   3 years
Performance-based Awards [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Equity instruments other than options, granted (in shares) 100,000.0  
Award vesting period   3 years
Minimum [Member] | Performance-based Awards [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Payout percentage of award   50.00%
Maximum [Member] | Performance-based Awards [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Payout percentage of award   200.00%