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Share-Based Payments - Summary of stock options by range of exercise prices (Details)
shares in Thousands
12 Months Ended
Sep. 30, 2016
$ / shares
shares
Options Outstanding  
Range of Exercise Prices, Number of Options Outstanding (in shares) | shares 5,584
Range of Exercise Prices, Weighted Average Remaining Contractual Term 6 years 1 month 6 days
Range of Exercise Prices, Weighted Average Exercise Price (in dollars per share) $ 22.95
Options Exercisable  
Range of Exercise Prices, Number of Options Exercisable (in shares) | shares 3,550
Range of Exercise Prices, Weighted Average Exercise Price (in dollars per share) $ 21.54
Range of Exercise Prices $5.24 - 19.99  
Information about stock options under option plans  
Lower Range of Exercise Prices (in dollars per share) 5.24
Upper Range of Exercise Prices (in dollars per share) $ 19.99
Options Outstanding  
Range of Exercise Prices, Number of Options Outstanding (in shares) | shares 1,169
Range of Exercise Prices, Weighted Average Remaining Contractual Term 3 years 7 months 6 days
Range of Exercise Prices, Weighted Average Exercise Price (in dollars per share) $ 12.84
Options Exercisable  
Range of Exercise Prices, Number of Options Exercisable (in shares) | shares 1,169
Range of Exercise Prices, Weighted Average Exercise Price (in dollars per share) $ 12.84
Range of Exercise Prices $20.00 - 31.58  
Information about stock options under option plans  
Lower Range of Exercise Prices (in dollars per share) 20.00
Upper Range of Exercise Prices (in dollars per share) $ 31.58
Options Outstanding  
Range of Exercise Prices, Number of Options Outstanding (in shares) | shares 4,415
Range of Exercise Prices, Weighted Average Remaining Contractual Term 6 years 8 months 12 days
Range of Exercise Prices, Weighted Average Exercise Price (in dollars per share) $ 25.63
Options Exercisable  
Range of Exercise Prices, Number of Options Exercisable (in shares) | shares 2,381
Range of Exercise Prices, Weighted Average Exercise Price (in dollars per share) $ 25.81