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Borrowing Arrangements (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2016
Mar. 31, 2015
Sep. 30, 2015
Sep. 30, 2014
Cash and cash equivalents $ 93,600 $ 34,100 $ 93,600 $ 34,100 $ 113,100 $ 161,100
Future maturities of outstanding borrowings            
Loss on early extinguishment of debt 0 $ 0 0 31,300    
Payments of Debt Issuance Costs     100 $ 8,400    
Debt Instrument, Unamortized Discount 2,000   2,000      
Domestic Line of Credit [Member]            
Revolving credit facility amount $ (225,000)   (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%   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 $ 27,800   $ 27,800      
Excess availability reduced by outstanding borrowings, outstanding letters of credit and accrued fees and expenses 179,800   $ 179,800      
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage     3750.00%      
Swing Line Loans [Member]            
Revolving credit facility amount (25,000)   $ (25,000)      
Letters Of Credit Outstanding [Member]            
Revolving credit facility amount (60,000)   (60,000)      
Secured Debt [Member]            
Long-term Debt, Gross $ 500,000   $ 500,000      
Debt Instrument, Basis Spread on Variable Rate     32500.00%      
Debt Instrument, Interest Rate, Effective Percentage 4.02%   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 $ 495,000   $ 495,000      
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%