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Commitments and Contingencies - Boral Transaction (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Nov. 20, 2016
Dec. 31, 2016
Sep. 30, 2016
Boral Transaction      
Common stock, par value (in dollars per share) $ 0.001 $ 0.001 $ 0.001
Cash Performance Unit Awards, 2017 Grants | End of fiscal 2018      
Compensation arrangements      
Percentage of performance units vesting   50.00%  
Cash Performance Unit Awards, 2017 Grants | End of fiscal 2019      
Compensation arrangements      
Percentage of performance units vesting   50.00%  
Cash Performance Unit Awards, 2017 Grants | Within 30 days of merger closing date      
Compensation arrangements      
Percentage of performance unit payments due   50.00%  
Cash Performance Unit Awards, 2017 Grants | Six months after merger closing date      
Compensation arrangements      
Percentage of performance unit payments due   50.00%  
Merger Agreement      
Boral Transaction      
Merger cash price per share (in dollars per share) 24.25    
Per month increase in per share cash payment if the merger is not consummated by the specified date $ 0.09    
Termination fee if Company terminates agreement $ 65.0    
Merger Agreement | Boral      
Boral Transaction      
Termination fee if Boral terminates agreement $ 75.0    
Executive Change in Control Agreements      
Compensation arrangements      
Aggregate value of severance payments and excess of market value of stock-based awards   $ 37.2  
Aggregate value of severance payments and excess of market value of stock-based awards expensed and accrued   $ 3.9  
Retention Agreements      
Compensation arrangements      
Term employees are required to be continuously employed after the date of closing to be eligible for retention payments   6 months  
Term employees are required to be continuously employed, under certain conditions, after the date of closing to be eligible for retention payments if the acquirer terminates the merger agreement   6 months  
Aggregate amount of commitments under terms of retention agreements   $ 5.5  
Aggregate amount of retention commitment expensed during the period   $ 0.0