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Borrowing Arrangements (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Sep. 30, 2015
Sep. 30, 2014
Jun. 30, 2014
Cash and cash equivalents $ 104,500   $ 113,100 $ 161,100 $ 45,100
Future maturities of outstanding borrowings          
Loss on early extinguishment of debt 0 $ 31,300      
Payments of Debt Issuance Costs 0 $ 7,900      
Debt Instrument, Unamortized Discount 2,100        
Domestic Line of Credit [Member]          
Revolving credit facility amount (225,000)        
Potential increase size of the credit facility by an additional amount $ 150,000        
Line of Credit Facility, Interest Rate at Period End 17500.00%        
Agreement termination date Dec. 18, 2017        
Aggregate commitments availability $ 22,500        
Aggregate commitments availability, percentage 10.00%        
Outstanding letter of credit accrued fees and expenses $ 27,900        
Excess availability reduced by outstanding borrowings, outstanding letters of credit and accrued fees and expenses $ 143,900        
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage 3750.00%        
Swing Line Loans [Member]          
Revolving credit facility amount $ (25,000)        
Letters Of Credit Outstanding [Member]          
Revolving credit facility amount (60,000)        
Secured Debt [Member]          
Long-term Debt, Gross $ 500,000        
Debt Instrument, Basis Spread on Variable Rate 32500.00%        
Debt Instrument, Interest Rate, Effective Percentage 4.02%        
Debt Instrument, Periodic Payment, Principal $ 1,250        
Agreement termination date Nov. 25, 2021        
Future maturities of outstanding borrowings          
Financial Liabilities Fair Value Disclosure $ 493,800        
Minimum [Member] | Domestic Line of Credit [Member]          
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage 2500.00%        
Maximum [Member] | Domestic Line of Credit [Member]          
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage 3750.00%        
London Interbank Offered Rate (LIBOR) [Member] | Secured Debt [Member]          
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum 0.75%        
London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] | Long-term Debt [Member]          
Debt Instrument, Basis Spread on Variable Rate 7500.00%        
London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] | Domestic Line of Credit [Member]          
Debt Instrument, Basis Spread on Variable Rate 17500.00%        
London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member] | Domestic Line of Credit [Member]          
Debt Instrument, Basis Spread on Variable Rate 22500.00%        
Base Rate [Member] | Maximum [Member] | Domestic Line of Credit [Member]          
Debt Instrument, Basis Spread on Variable Rate 12500.00%