Income Taxes (Details 2) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Sep. 30, 2011
Deferred tax assets:
Net operating loss carryforwards	$ 8,626	$ 9,263
Vacation accrual	2,586	2,687
Pension accrual	5,201	6,308
Allowance for bad debts	2,845	4,328
Fair value of derivative instruments		3,060
Insurance accrual	18,085	17,520
Inventory	869	702
Alternative minimum tax credit carryforward	261	261
Other, net	2,188	2,523
Total deferred tax assets	40,661	46,652
Valuation allowance	(658)	(672)
Net deferred tax assets	40,003	45,980
Deferred tax liabilities:
Property and equipment	1,947	1,077
Intangibles	20,164	14,102
Fair value of derivative instruments	484
Total deferred tax liabilities	22,595	15,179
Net deferred taxes	$ 17,408	$ 30,801