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Debt - Cash Convertible Senior Notes Due 2019 (Details)
$ / shares in Units, shares in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Jul. 31, 2017
USD ($)
$ / shares
shares
Jul. 31, 2014
USD ($)
Jun. 30, 2014
USD ($)
$ / shares
$ / share
shares
Jun. 30, 2018
Jun. 30, 2018
2019 Convertible Notes          
Debt Instrument [Line Items]          
Convertible senior notes issued and settled | $   $ 30,000,000.0 $ 200,000,000.0    
Stated interest rate     2.125%    
Convertible senior notes repurchased and retired | $ $ 35,000,000        
Effective interest rate during period       8.00% 8.00%
2024 Convertible Notes          
Debt Instrument [Line Items]          
Convertible senior notes issued and settled | $ $ 34,400,000.0        
Stated interest rate 2.875%        
Effective interest rate during period       9.00% 9.00%
Common Stock Class A Non-voting | 2019 Convertible Notes          
Debt Instrument [Line Items]          
Conversion rate per $1,000 principal amount     62.2471    
Conversion price, per share (in dollars per share) | $ / shares     $ 16.065    
Common Stock Class A Non-voting | 2024 Convertible Notes          
Debt Instrument [Line Items]          
Conversion rate per $1,000 principal amount 100        
Conversion price, per share (in dollars per share) | $ / shares $ 10.00        
Convertible Notes Hedges | Common Stock Class A Non-voting          
Debt Instrument [Line Items]          
Notional amount (shares) | shares     12.1    
Strike price (dollars per share) | $ / share     16.065    
Net-share-settled Warrants | Common Stock Class A Non-voting          
Debt Instrument [Line Items]          
Number of securities called (shares) | shares 9.4        
Strike price for warrants (in dollars per share) | $ / shares $ 20.83