Quarterly report pursuant to Section 13 or 15(d)

Equity and Long-Term Incentive Compensation Plans - Cash Dividends (Details)

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Equity and Long-Term Incentive Compensation Plans - Cash Dividends (Details) - USD ($)
3 Months Ended
Aug. 31, 2018
Aug. 02, 2018
Dec. 09, 2014
Nov. 19, 2014
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2014
Jun. 30, 2018
Dividends Payable                
Cash dividends declared (in dollars per share)         $ 0.75 $ 0.59    
Payment of dividends         $ 122,757,000 $ 100,327,000    
Dividends payable         4,783,000 7,011,000    
Regular cash dividend                
Dividends Payable                
Cash dividends declared (in dollars per share)   $ 0.75            
Cash dividends paid per share (in dollars per share) $ 0.75              
Regular cash dividend | Restricted stock unit, Performance-based and Service-based                
Dividends Payable                
Dividends payable         4,800,000     $ 6,700,000
Regular cash dividend | Additional paid-in capital                
Dividends Payable                
Payment of dividends         119,900,000 94,100,000    
Special cash dividend                
Dividends Payable                
Cash dividends declared (in dollars per share)       $ 16.50        
Cash dividends paid per share (in dollars per share)     $ 16.50          
Cash dividends paid             $ 2,760,000,000  
Special cash dividend | Restricted stock unit, Performance-based and Service-based                
Dividends Payable                
Dividends payable         37,500   $ 43,000,000 $ 2,800,000
Cash dividends paid         $ 2,800,000 $ 6,200,000