Long-term Debt (Details 3) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Dec. 31, 2012
ABL Revolver
Long-term debt
Maximum borrowing capacity	$ 70.0
Current borrowing capacity	37.9
Line of credit facility, interest rate at period end (as a percent)	3.10%
Termination period prior to the earliest maturity date of long-term debt	3 months
ABL Revolver | Minimum
Long-term debt
Line of credit facility unused capacity commitment fee percentage	0.25%
Coverage ratio	1.0
ABL Revolver | Maximum
Long-term debt
Line of credit facility unused capacity commitment fee percentage	0.50%
Specified percentage of availability in which a monthly fixed charge coverage ratio applies	15.00%
ABL Revolver | LIBOR
Long-term debt
Variable interest rate base	LIBOR
Percentage points added to the reference rate, one	2.25%
Percentage points added to the reference rate, two	2.50%
Percentage points added to the reference rate, three	2.75%
ABL Revolver | Base rate
Long-term debt
Variable interest rate base	Base rate
Percentage points added to the reference rate, one	1.00%
Percentage points added to the reference rate, two	1.25%
Percentage points added to the reference rate, three	1.50%
ABL Revolver | Federal funds rate
Long-term debt
Variable interest rate base	Federal funds rate
Interest rate margin (as a percent)	0.50%
ABL Revolver | 30-day LIBOR
Long-term debt
Variable interest rate base	30-day LIBOR
Interest rate margin (as a percent)	1.00%
ABL Revolver | Prime rate
Long-term debt
Variable interest rate base	Prime rate
Letters of credit
Long-term debt
Maximum borrowing capacity	35.0
Outstanding standby letters of credit	18.9
Swingline facility
Long-term debt
Maximum borrowing capacity	$ 10.5