Employee Benefit Plans (Details) (USD $)	12 Months Ended										0 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2014 Vesting Period 1 [Member]	Sep. 30, 2014 Vesting Period 2 [Member]	Sep. 30, 2014 Vesting Period 3 [Member]	Sep. 30, 2014 Maximum [Member]	Sep. 30, 2014 Minimum [Member]	Sep. 30, 2014 Savings Related Share Option Scheme [Member]	Sep. 30, 2013 Savings Related Share Option Scheme [Member]	Feb. 28, 2014 ESPP [Member]	Feb. 27, 2015 ESPP [Member]	Sep. 30, 2014 ESPP [Member]
Defined Contribution Plan, Maximum Annual Contribution Per Employee, Percent (in hundredths)	40.00%
Defined Contribution Plan, Employer Matching Contribution, Percent (in hundredths)	3.50%							6.00%
Defined Contribution Plan Discretionary Profit Contribution Vesting Period	6 years
Retirement benefits maximum payout period for annual installments	15 years
Defined Contribution Plan, Cost Recognized	$ 41,400,000	$ 45,000,000	$ 44,500,000
Non-Qualifed Deferred Compensation Plan Deferral Percentage (in hundredths)	50.00%
Deferred Compensation Deferral Amount	$ 2,000
Stock Issued During Period, Shares, Employee Stock Purchase Plans (in shares)									3,000		100,000
Employee stock purchase plan, shares available for grant (in shares)	20,700,000									474,000			700,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period				3 years	5 years	7 years	5 years	3 years
Expected future share grants (in shares)									2,000			100,000
Option price to exercise date market price (in hundredths)	95.00%								80.00%