Income Taxes (Details) (USD $)	3 Months Ended								12 Months Ended
	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Income Taxes
Income (loss) from domestic operations before income tax expense									$ (89,200,000)	$ 148,000,000	$ 173,800,000
Income from foreign operations before income tax expense									106,700,000	236,200,000	167,300,000
Current:
Federal									29,300,000	500,000	15,900,000
State									2,100,000	12,100,000	7,200,000
Foreign									63,300,000	58,300,000	46,800,000
Total current income tax expense									94,700,000	70,900,000	69,900,000
Deferred:
Federal									(19,200,000)	38,500,000	15,400,000
State									600,000	(8,700,000)	500,000
Foreign									(1,700,000)	(600,000)	5,900,000
Total deferred income tax (benefit) expense									(20,303,000)	29,200,000	21,840,000
Total income tax expense	16,700,000	21,400,000	16,700,000	19,600,000	36,400,000	23,900,000	19,300,000	20,500,000	74,416,000	100,090,000	91,696,000
Major elements contributing to the difference between the U.S. federal statutory rate of 35.0% and the effective tax rate
Tax at federal statutory rate									6,100,000	134,500,000	119,400,000
State income tax, net of federal benefit									1,100,000	6,900,000	7,300,000
U.S. income tax credits									(4,100,000)	(11,100,000)	(21,100,000)
Foreign tax rate differential									(25,400,000)	(19,500,000)	(400,000)
Foreign Research and Experimentation credits									(5,800,000)	(6,100,000)	(6,400,000)
Tax audits									2,100,000
Goodwill impairment									101,100,000
Change in uncertain tax positions									(4,100,000)	1,900,000	(3,900,000)
Valuation allowance									500,000	(3,100,000)	(1,300,000)
Other items, net									2,900,000	(3,400,000)	(1,900,000)
Total income tax expense	$ 16,700,000	$ 21,400,000	$ 16,700,000	$ 19,600,000	$ 36,400,000	$ 23,900,000	$ 19,300,000	$ 20,500,000	$ 74,416,000	$ 100,090,000	$ 91,696,000
Major elements contributing to the difference between the U.S. federal statutory rate of 35.0% and the effective tax rate
Tax at federal statutory rate (as a percent)									35.00%	35.00%	35.00%
State income tax, net of federal benefit (as a percent)									6.30%	1.80%	2.10%
U.S. income tax credits (as a percent)									(23.40%)	(2.90%)	(6.20%)
Foreign tax rate differential (as a percent)									(145.10%)	(5.00%)	(0.10%)
Foreign Research and Experimentation credits (as a percent)									(33.30%)	(1.60%)	(1.90%)
Tax audits (as a percent)									12.00%
Goodwill impairment (as a percent)									578.30%
Change in uncertain tax positions (as a percent)									(23.40%)	0.50%	(1.10%)
Valuation allowance (as a percent)									2.70%	(0.80%)	(0.40%)
Other items, net (as a percent)									16.60%	(0.90%)	(0.50%)
Effective tax rate (as a percent)									425.70%	26.10%	26.90%