Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Cash payments for:
Interest	$ 15,655	$ 24,440	$ 16,343
Income taxes	16,996	24,457	5,977
Schedule of non-cash investing and financing activities:
Property and equipment acquired pursuant to capital leases	$ 333	1,528	$ 2,923
Property and equipment disposed of pursuant to termination of capital leases		$ (5,414)