Income Tax Expense (Details)	3 Months Ended		6 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012
Income Tax Expense [Line Items]
Effective income tax rate	56.00%	38.60%	53.00%	38.20%
Increase in effective tax rate		3.20%		2.10%
Estimated annual effective income tax rate			37.00%
Foreign Valuation Allowance [Member]
Income Tax Expense [Line Items]
Increase in effective tax rate	50.10%		46.20%
American Taxpayer Relief Act Of 2012 [Member]
Income Tax Expense [Line Items]
Decrease in effective tax rate	27.60%		25.50%