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Capital Stock Outstanding Common Shares Roll Forward (Details)
 9 Months Ended
Jun. 30, 2017
shares
Outstanding Shares [Roll Forward]  
Series A common stock, shares outstanding 161,693,051
Treasury Stock, Shares, Acquired (4,581,227)
Exercise of stock options 872,452
Vesting of restricted stock units, net of shares withheld for taxes 256,155
Settlement of performance-based restricted stock units, net of shares withheld for taxes 160,063
Exercise of employee stock purchase plan instruments 113,693
Series A common stock, shares outstanding 158,514,187