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Investments (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended
Sep. 11, 2013
May 06, 2013
Jan. 31, 2011
Jun. 30, 2017
Mar. 31, 2017
Web International Education Group, Ltd.(Web)          
Investments          
Investment   $ 10.0 $ 10.0    
Ownership percentage     20.00%    
Impairment of investment in Web International Education Group, Ltd       $ 10.0  
Web International Education Group, Ltd.(Web) | Other current assets          
Investments          
Investment reclassified   $ 10.0      
School Mortgage          
Investments          
Interest on investment (as a percent) 5.25%        
Issuance of a mortgage note $ 2.1        
Note receivable term 5 years        
Fair value of assets held for sale         $ 1.2
Impairment loss         $ 0.6