Credit Agreements (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended						1 Months Ended		3 Months Ended				12 Months Ended				1 Months Ended			1 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2009	Sep. 30, 2011 Credit agreement M numerator denominator	Sep. 30, 2011 Credit agreement Minimum	Sep. 30, 2011 Credit agreement Maximum	Oct. 31, 2011 Senior Secured Term Loan	Sep. 30, 2010 Senior Secured Term Loan	Sep. 30, 2011 Senior Secured Term Loan	Dec. 31, 2010 Senior Secured Term Loan	Sep. 30, 2011 Revolving credit facility	Sep. 27, 2010 Revolving credit facility	Sep. 30, 2011 Credit agreement - dollar-denominated loans	Sep. 30, 2011 Credit agreement - dollar-denominated loans Federal Funds rate	Sep. 30, 2011 Credit agreement - dollar-denominated loans LIBOR	Sep. 30, 2011 Senior notes	Mar. 31, 2010 8 1/4 % Senior notes due March 2017	Sep. 30, 2011 8 1/4 % Senior notes due March 2017	Sep. 30, 2010 8 1/4 % Senior notes due March 2017	Mar. 31, 2010 8 1/2 % Senior notes due March 2020	Sep. 30, 2011 8 1/2 % Senior notes due March 2020	Sep. 30, 2010 8 1/2 % Senior notes due March 2020	Sep. 30, 2011 Other long-term facilities	Sep. 30, 2010 Other long-term facilities	Sep. 30, 2011 Letter of credit	Sep. 30, 2011 Interest rate contracts
Long term debt
Long term debt	$ 1,060.1	$ 1,152.1						$ 650.0	$ 560.0									$ 250.0	$ 250.0		$ 250.0	$ 250.0	$ 0.1	$ 2.1
Current portion	(40.1)	(65.7)
Long term debt net of current maturities	1,020.0	1,086.4
Debt, current
Revolving line of credit		150.0
Current portion of long -term debt	40.1	65.7
Other short-term facilities		0.2
Revolving credit facility and current maturities of long-term debt	40.1	215.9
Debt instrument interest rate (as a percent)																	8.25%	8.25%	8.25%	8.50%	8.50%	8.50%
Maximum borrowing capacity												550
Debt issued								650.0									250.0			250.0
Quarterly principal installment, at commencement										16.25
Payment due at maturity									341.25
Repayment of long-term debt	91.40	2,020.90	682.20				40.00		8.75
Letters of credit outstanding																									27.9
Available borrowing capacity											522.1
Revolving credit facility, unused commitment fee rate (as a percent)					0.40%	0.50%
Variable rate basis	3-month LIBOR			LIBOR plus a specified margin									base rate (which is the highest of (a) the administrative agent's prime rate, (b) the federal funds rate plus 0.50% or (c) the sum of 1% plus one-month LIBOR) plus a specified margin	federal funds rate	one-month LIBOR
Letter of credit fees percentage on available borrowing capacity, low end of range (as a percent)																									1.125%
Letter of credit fees percentage on available borrowing capacity, high end of range (as a percent)																									3.50%
Interest spread in basis points (as a percent)									2.50%		2.50%			0.50%	1.00%
Weighted-average interest rate (as a percent)									2.77%
Derivative fixed interest rate (as a percent)				5.105%
Derivative fixed interest rate and spread (as a percent)				0.37%
Derivative variable interest rate (as a percent)				7.605%
Notional amount of interest rate derivative				250.0
Changes in fair value of interest rate cash flow hedge recorded in accumulated other comprehensive income (loss) before tax																										(2.1)
Changes in fair value of interest rate cash flow hedge recorded in accumulated other comprehensive income (loss), net of tax																										(1.4)
Maximum leverage ratio, numerator				4.50
Maximum leverage ratio, denominator				1.0
Minimum interest coverage ratio, numerator				2.50
Minimum interest coverage ratio, denominator				1.0
Maximum senior secured leverage ratio for June 30, 2011 through September 30, 2011, numerator				3.25
Maximum senior secured leverage ratio for June 30, 2011 through September 30, 2011, denominator				1.0
Maximum senior secured leverage ratio for December 31, 2011 through September 30, 2012, numerator				3.00
Maximum senior secured leverage ratio for December 31, 2011 through September 30, 2012, denominator				1.0
Maximum senior secured leverage ratio after September 30, 2012, numerator				2.75
Maximum senior secured leverage ratio after September 30, 2012, denominator				1.0
Period within which entity expects to be able to meet the financial covenants (in months)				12
Dividend payment restriction under credit agreement
Maximum aggregate dividends and other distributions allowed during any fiscal year				50
Percentage of consolidated net income of the Company and its consolidated subsidiaries for all fiscal quarters ending after September 27, 2010 (as a percent)				25.00%
Maximum aggregate dividends and other distributions allowed per quarter for each of first four fiscal quarters				25
Maximum leverage ratio for determining the restriction on dividends and other distributions, numerator				2.0
Maximum leverage ratio for determining the restriction on dividends and other distributions, denominator				1.0
Maximum aggregate dividends and other distributions allowed during the current four quarters ending and for each period of four quarters ending thereafter				100
Fair value of debt																$ 501