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Earnings per Share - Additional information (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Dec. 01, 2016
Dec. 01, 2015
Dec. 01, 2014
Dec. 02, 2013
Nov. 30, 2016
Nov. 30, 2015
Nov. 30, 2014
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2017
Mar. 31, 2016
Nov. 30, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                        
Impact of convertible notes (in shares)               2,700,000 0 1,300,000 0  
Impact of restricted shares, restricted share units and performance share units (in shares)               1,100,000 1,200,000 1,200,000 1,600,000  
Share-based compensation expense               $ 4 $ 3 $ 7 $ 6  
Antidilutive shares excluded from computation of earnings per share (in shares)                 700,000   300,000  
Convertible Notes | 7.875% Convertible Notes Due 2026                        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                        
Interest rate               7.875%   7.875%    
Executive Officer                        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                        
Number or shares issuable per performance share unit (in shares)         1 1 1          
Executive Officer | Performance Shares                        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                        
Number or shares issuable per performance share unit (in shares)                       1
Exercise price (in usd per share) $ 12.77 $ 10.51 $ 13.74 $ 7.97                
Executive Officer | Performance Shares | Performance period of October 1, 2015 to September 30, 2018                        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                        
Performance period         3 years 3 years            
Shares authorized for grant (in shares)           700,000            
Executive Officer | Performance Shares | Performance period of October 1, 2015 to September 30, 2018 | Minimum                        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                        
Performance-based vesting percentage                   0.00%    
Executive Officer | Performance Shares | Performance period of October 1, 2015 to September 30, 2018 | Maximum                        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                        
Performance-based vesting percentage                   200.00%    
Executive Officer | Performance Shares | Performance period of October 1, 2015 to September 30, 2018 | Performance Objective One                        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                        
Award vesting rights percentage                   50.00%    
Executive Officer | Performance Shares | Performance period of October 1, 2015 to September 30, 2018 | Performance Objective Two                        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                        
Award vesting rights percentage                   50.00%    
Executive Officer | Performance Shares | Performance period of October 1, 2016 to September 30, 2019                        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                        
Shares authorized for grant (in shares)         600,000              
Executive Officer | Performance Shares | Performance period of October 1, 2016 to September 30, 2019 | Minimum                        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                        
Performance-based vesting percentage                   0.00%    
Executive Officer | Performance Shares | Performance period of October 1, 2016 to September 30, 2019 | Maximum                        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                        
Performance-based vesting percentage                   200.00%    
Executive Officer | Performance Shares | Performance period of October 1, 2016 to September 30, 2019 | Performance Objective One                        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                        
Award vesting rights percentage                   50.00%    
Executive Officer | Performance Shares | Performance period of October 1, 2016 to September 30, 2019 | Performance Objective Two                        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                        
Award vesting rights percentage                   25.00%    
Executive Officer | Performance Shares | Performance period of October 1, 2016 to September 30, 2019 | Performance Objective Three                        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                        
Award vesting rights percentage                   25.00%    
Executive Officer | Performance Shares | Performance period of October 1, 2014 to September 30, 2017                        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                        
Performance period                   3 years    
Shares authorized for grant (in shares)             600,000          
Executive Officer | Performance Shares | Performance period of October 1, 2014 to September 30, 2017 | Minimum                        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                        
Performance-based vesting percentage                   0.00%    
Executive Officer | Performance Shares | Performance period of October 1, 2014 to September 30, 2017 | Maximum                        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                        
Performance-based vesting percentage                   200.00%    
Executive Officer | Performance Shares | Performance period of October 1, 2014 to September 30, 2017 | Performance Objective One                        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                        
Award vesting rights percentage                   75.00%    
Executive Officer | Performance Shares | Performance period of October 1, 2014 to September 30, 2017 | Performance Objective Two                        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                        
Award vesting rights percentage                   25.00%    
Executive Officer | Performance Shares | Performance period of October 1, 2013 to September 30, 2016                        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                        
Performance period 3 years                      
Performance share units vested or forfeited, percentage 112.00%                      
Impact of convertible notes (in shares)               200,000 1,100,000 600,000 1,000,000  
Executive Officer | Restricted Share Units (RSUs)                        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                        
Exercise price (in usd per share) $ 12.77 $ 10.51 $ 13.74                  
Shares granted (in shares)         500,000 500,000 400,000          
Vesting period 3 years 3 years 3 years