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Accrued Liabilities (Changes in Loss Reserve Activity) (Details) - Loss Reserve On Contractual Lease Commitments [Member] - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Restructuring Cost and Reserve [Line Items]    
Restructuring charges, beginning of period $ 3,931 $ 5,270
Payments, net of sublease income (117) (553)
Restructuring charges, end of period $ 3,814 $ 4,717