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Accrued Liabilities (Loss Reserve Activity) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Sep. 30, 2017
Restructuring Cost and Reserve [Line Items]          
Restructuring Charges $ 17,013 $ 0 $ 17,013 $ 0  
Loss Reserve On Contractual Lease Commitments [Member]          
Restructuring Cost and Reserve [Line Items]          
Loss reserve on contractual lease commitments, beginning of period 4,717 8,840 5,270 9,242  
Payments, net of sublease income (239) (445) (792) (847)  
Loss reserve on contractual lease commitments, end of period 4,478 $ 8,395 4,478 $ 8,395  
Loss reserve, noncurrent portion $ 3,233   $ 3,233   $ 3,927