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Share-based Compensation (Narratives) (Details)
3 Months Ended 9 Months Ended
Mar. 31, 2018
$ / shares
shares
Dec. 31, 2017
shares
Sep. 30, 2017
Quarter
$ / shares
shares
Mar. 31, 2017
$ / shares
shares
Dec. 31, 2016
shares
Sep. 30, 2016
$ / shares
shares
Mar. 31, 2018
$ / shares
shares
Mar. 31, 2017
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Restricted stock units granted | shares             4,335,000  
Restricted stock units granted, grant date fair value             $ 11.26  
2014 Employee Stock Purchase Plan                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Stock options granted | shares 1,151,759     1,114,707     2,419,689 2,218,306
Weighted-average grant-date fair value of options granted (in dollars per share) $ 4.00     $ 1.34     $ 3.26 $ 1.24
Restricted Stock Units                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Restricted stock units granted, percentage     40.00%          
Share-based compensation arrangement by share-based payment award, award vesting percentage     The RSUs vest from the original grant date as to one-third (1/3) on the one-year anniversary and one-twelfth (1/12) each quarter thereafter, subject to continued service to the Company.     The RSUs vest from the original grant date as to one-third (1/3) on the one-year anniversary and one-twelfth (1/12) each quarter thereafter, subject to continued service to the Company.    
Performance Shares                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Restricted stock units granted | shares 0 0     0   0  
Restricted stock units granted, grant date fair value     $ 10.90          
Performance Shares | Minimum                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Restricted stock units granted, grant date fair value           $ 3.02    
Performance Shares | Maximum                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Restricted stock units granted, grant date fair value           $ 3.09    
Service-based Restricted Stock Units                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Restricted stock units granted, percentage     50.00%     50.00%    
Market-Based Vesting | Minimum                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Restricted stock units granted, grant date fair value $ 10.61              
Market-Based Vesting | Maximum                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Restricted stock units granted, grant date fair value $ 12.19              
VPs | Restricted Stock Units                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Restricted stock units granted | shares     1,154,014     1,505,120    
VPs | Performance Shares                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Restricted stock units granted, percentage     50.00%     50.00%    
VPs | Market-Based Vesting                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Restricted stock units granted | shares 100,000              
Executive Officers | Restricted Stock Units                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Restricted stock units granted | shares     560,344     680,000    
Other Employees | Restricted Stock Units                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Restricted stock units granted | shares     939,925     1,053,300    
Chief Executive Officers | Performance Shares                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Restricted stock units granted, percentage     60.00%          
Employees | Performance Shares                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Performance stock unit vesting, earnings per share     $ 0.32          
Performance stock unit vesting, consecutive quarters | Quarter     2          
Restricted stock units vesting, stock trigger price     $ 16.00     $ 5.00    
Restricted stock units vesting, Threshold consecutive trading days after January 1, 2017           30 days