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Commitments and Contingencies - Boral Transaction abd Compensation Arrangements (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Nov. 20, 2016
Dec. 31, 2016
Mar. 31, 2017
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     $ 39.9  
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     $ 6.8