Accrued Expenses and Other Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Sep. 30, 2017
Payables and Accruals [Abstract]
Salaries, wages and other benefits	$ 27,181	$ 52,116
Severance payments	444	3,542
Taxes, other than income	10,113	9,244
Obligations under capital leases	11,885	9,777
Third party commissions	4,300	6,968
Insurance liabilities	4,293	4,915
Provisions for litigation	1,850	4,715
Earn-outs related to acquisitions	7,218	4,304
Other	23,111	26,342
Accrued expenses and other liabilities	$ 90,395	$ 121,923