Components of Net Deferred Taxes (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Deferred tax assets:
Net operating loss carryforwards	$ 5,490	$ 6,760
Vacation accrual	2,970	2,580
Pension accrual	2,964	2,672
Allowance for bad debts	3,661	3,158
Fair value of derivative instruments	5,000	2,314
Insurance accrual	22,823	21,073
Inventory capitalization	865	941
Alternative minimum tax credit carryforward	261	261
Other, net	2,060	1,906
Total deferred tax assets	46,094	41,665
Deferred tax liabilities:
Property and equipment	2,383	2,225
Inventory costing method	256
Intangibles	30,495	26,285
Total deferred tax liabilities	33,134	28,510
Net deferred taxes	$ 12,960	$ 13,155