Annual report pursuant to Section 13 and 15(d)

Stockholders' equity - Initial Public Offering (Details)

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Stockholders' equity - Initial Public Offering (Details)
$ in Thousands
 12 Months Ended
May 11, 2015
GBP (£)
shares
May 11, 2015
USD ($)
shares
Jun. 30, 2015
USD ($)
shares
Jun. 30, 2014
USD ($)
shares
Stockholders' equity        
Issuance of stock       $ 15,812
Proceeds from issuance of common stock   $ 175,989 $ 175,989  
Initial Public Offering        
Stockholders' equity        
Issuance of American Depositary Shares (in shares) | shares 11,250,000 11,250,000    
Issuance of stock     175,989  
Common stock        
Stockholders' equity        
Issuance of stock (in shares) | shares       70,208,600
Issuance of stock       $ 112
Stock issuance costs   $ 13,387 $ 13,387  
Common stock | Initial Public Offering        
Stockholders' equity        
Issuance of stock (in shares) | shares 67,500,000 67,500,000 67,500,000  
Issuance of stock £ 67,500 $ 104 $ 104