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Financing Arrangements (Additional Information) (Detail)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Sep. 30, 2012
USD ($)
Sep. 30, 2013
Sep. 30, 2012
USD ($)
Apr. 05, 2012
USD ($)
Sep. 30, 2013
Revolving Credit Facility [Member]
USD ($)
Apr. 05, 2012
Revolving Credit Facility [Member]
USD ($)
Apr. 05, 2012
Letter Of Credit [Member]
USD ($)
Sep. 30, 2013
Term Loan [Member]
USD ($)
Apr. 05, 2012
Term Loan [Member]
USD ($)
Sep. 30, 2013
Consolidated Total Leverage Ratio [Member]
Sep. 30, 2013
Standby Letters Of Credit [Member]
USD ($)
Sep. 30, 2013
Canadian Revolving Credit facility [Member]
USD ($)
Sep. 30, 2013
Canadian Revolving Credit facility [Member]
CAD
Sep. 30, 2013
Maximum [Member]
Sep. 30, 2013
Maximum [Member]
Consolidated Total Leverage Ratio [Member]
Sep. 30, 2013
Minimum [Member]
Sep. 30, 2013
Minimum [Member]
Consolidated Total Leverage Ratio [Member]
Sep. 30, 2013
Term Loan Facilitys [Member]
Maximum [Member]
LIBOR [Member]
Sep. 30, 2013
Term Loan Facilitys [Member]
Minimum [Member]
LIBOR [Member]
Sep. 30, 2013
Equipment Financing Facility [Member]
USD ($)
Sep. 30, 2013
Equipment Financing Facility [Member]
Three Year Term Swap Rate [Member]
Sep. 30, 2013
Equipment Financing Facility [Member]
Four Year Term Swap Rate [Member]
Sep. 30, 2013
U.S. Senior Secured Credit Facility [Member]
Maximum [Member]
Base Rates [Member]
Sep. 30, 2013
U.S. Senior Secured Credit Facility [Member]
Minimum [Member]
Base Rates [Member]
Sep. 30, 2013
U.S. Senior Secured Credit Facility [Member]
Term Loan Facilitys [Member]
LIBOR [Member]
Sep. 30, 2012
U.S. Senior Secured Credit Facility [Member]
Term Loan Facilitys [Member]
LIBOR [Member]
Sep. 30, 2013
Canadian Senior Secured Credit Facility [Member]
Maximum [Member]
Sep. 30, 2013
Canadian Senior Secured Credit Facility [Member]
Minimum [Member]
Apr. 05, 2012
Wells Fargo Bank National Association [Member]
USD ($)
Apr. 05, 2012
Wells Fargo Bank National Association [Member]
CAD
Debt Instrument [Line Items]                                                            
Line of credit facility, amount outstanding       $ 550.0 $ 45.0 $ 325.0 $ 20.0 $ 208.1 $ 225.0   $ 7.0 $ 2.4 2.5                               $ 14.6 15.0
Line Of Credit Facility Additional Borrowing Capacity 200   200                                                      
Debt instrument, maximum financing amount                                       30                    
Senior notes payable to commercial lenders, interest rate margin                                   1.93% 1.75%       1.93% 1.75% 1.75% 1.75% 3.75% 0.75%    
Line of credit facility, unused fees   0.375%                       0.50%   0.35%                            
Debt instrument, amount outstanding                                       10.6                    
Debt instrument, fixed interest rate minimum                                       2.51%                    
Debt instrument, fixed interest rate maximum                                       6.75%                    
Percentage Of Amortization Of Term Loan   5.00%                                                        
Line of Credit Facility, Interest Rate During Period                   0.75%       2.50% 1.50% 1.50% 0.50%       1.26% 1.21%                
Line of Credit Facility, Interest Rate Description   higher of the Prime Rate, or the Federal Funds Rate plus 0.50%, plus a margin above that rate     LIBOR plus 1.75% (1.93% at September 30, 2013)                                                  
Line Of Credit Facility Rate Descriptions   the higher of the Canadian Prime Rate, or the annual rate of interest equal to the sum of the CDOR rate plus 1.0%, plus a margin above that rate.                                                        
Amortization Frequency   quarterly                                                        
Repayments of Long-term Debt     304.0                                                      
Proceeds from Lines of Credit     79                                                      
Debt Issuance Cost 1.2                                                          
Extinguishment of Debt, Gain (Loss), Net of Tax $ 0.7