Share-Based Payments Summary of Performance Share Unit and Market Share Unit Activity (Details) shares in Thousands	3 Months Ended
	Dec. 31, 2015 $ / shares shares
Performance Share Units
Shares
Outstanding at October 1, 2015 | shares	281
Granted | shares	91
Released | shares	(156)
Forfeited | shares	(28)
Outstanding at December 31, 2015 | shares	188
Weighted- average Grant-date Fair Value
Outstanding at October 1, 2015 (in dollars per share) | $ / shares	$ 53.70
Granted (in dollars per share) | $ / shares	85.61
Released (in dollars per share) | $ / shares	49.36
Forfeited (in dollars per share) | $ / shares	71.86
Outstanding at December 31, 2015 (in dollars per share) | $ / shares	$ 70.03
Market Share Units
Shares
Outstanding at October 1, 2015 | shares	129
Granted | shares	114
Released | shares	(101)
Outstanding at December 31, 2015 | shares	142
Weighted- average Grant-date Fair Value
Outstanding at October 1, 2015 (in dollars per share) | $ / shares	$ 88.65
Granted (in dollars per share) | $ / shares	100.63
Released (in dollars per share) | $ / shares	85.65
Outstanding at December 31, 2015 (in dollars per share) | $ / shares	$ 100.40