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Subsequent Events (Details)
1 Months Ended 3 Months Ended 9 Months Ended
Jul. 31, 2017
USD ($)
day
$ / shares
Jun. 30, 2014
day
$ / shares
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Subsequent Event [Line Items]          
Aggregate principal amount       $ 280,000,000  
Proceeds from settlement of forward currency contracts       0 $ 3,557,000
Subsequent Event          
Subsequent Event [Line Items]          
Amount of debt extinguished $ 5,300,000        
Proceeds from repayment of notes receivable 6,200,000        
2.875% Convertible Senior Notes, Due 2024 | Senior Notes | Subsequent Event          
Subsequent Event [Line Items]          
Aggregate principal amount $ 143,750,000.00        
Stated interest rate 2.875%        
2.125% Cash convertible senior notes due 2019          
Subsequent Event [Line Items]          
Stated interest rate   2.125%      
Repurchase price, percent of principal amount   100.00%      
2.125% Cash convertible senior notes due 2019 | Subsequent Event          
Subsequent Event [Line Items]          
Repayments of secured debt $ 34,400,000        
Amount of debt extinguished $ 35,000,000        
Common Stock Class A | 2.875% Convertible Senior Notes, Due 2024 | Senior Notes | Subsequent Event          
Subsequent Event [Line Items]          
Conversion rate per $1000 principal amount 100        
Conversion price, per share (in dollars per share) | $ / shares $ 10        
Common Stock Class A | 2.875% Convertible Senior Notes, Due 2024 | Senior Notes | Company Option | Subsequent Event          
Subsequent Event [Line Items]          
Threshold percentage of stock price trigger 130.00%        
Threshold trading days (whether or not consecutive) | day 20        
Threshold consecutive trading days | day 30        
Repurchase price, percent of principal amount 100.00%        
Common Stock Class A | 2.875% Convertible Senior Notes, Due 2024 | Senior Notes | Holder Option | Subsequent Event          
Subsequent Event [Line Items]          
Threshold percentage of stock price trigger 130.00%        
Threshold trading days (whether or not consecutive) | day 20        
Threshold consecutive trading days | day 30        
Early conversion condition, business day period 5 days        
Measurement period 5 days        
Early conversion condition, percent of product of the last reported sale price of stock and the conversion rate, less than 98% 98.00%        
Common Stock Class A | 2.125% Cash convertible senior notes due 2019          
Subsequent Event [Line Items]          
Conversion rate per $1000 principal amount   62.2471      
Conversion price, per share (in dollars per share) | $ / shares   $ 16.065      
Threshold percentage of stock price trigger   130.00%      
Threshold trading days (whether or not consecutive) | day   20      
Threshold consecutive trading days | day   30      
Early conversion condition, business day period   5 days      
Measurement period   5 days      
Early conversion condition, percent of product of the last reported sale price of stock and the conversion rate, less than 98%   98.00%      
Line of Credit | Senior Secured Credit Facility          
Subsequent Event [Line Items]          
Aggregate principal amount       $ 50,000,000  
Line of Credit | Senior Secured Credit Facility | Subsequent Event          
Subsequent Event [Line Items]          
Repayments of secured debt $ 51,600,000        
Cash Convertible Notes Hedges | Subsequent Event          
Subsequent Event [Line Items]          
Proceeds from settlement of forward currency contracts 600,000        
Cash Convertible Notes Warrants | Subsequent Event          
Subsequent Event [Line Items]          
Payments for early repayment of derivative instrument 500,000        
Amount of derivative settled $ 2,200,000        
Forecast          
Subsequent Event [Line Items]          
Debt extinguishment costs     $ 5,000,000    
Net proceeds from debt issuance     $ 54,000,000