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Components of Net Deferred Taxes (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Sep. 30, 2014
Deferred tax assets:    
Net operating loss carryforwards $ 7,367 $ 5,490
Vacation accrual 3,295 2,970
Pension accrual 9,244 2,964
Allowance for bad debts 2,654 3,661
Fair value of derivative instruments 6,773 5,000
Insurance accrual 24,682 22,823
Inventory capitalization 1,038 865
Alternative minimum tax credit carryforward 266 261
Other, net 1,630 2,060
Total deferred tax assets 56,949 46,094
Valuation allowance (3,027)  
Net deferred tax assets 53,922 46,094
Deferred tax liabilities:    
Property and equipment 2,831 2,383
Inventory costing method 497 256
Intangibles 34,286 30,495
Total deferred tax liabilities 37,614 33,134
Net deferred taxes $ 16,308 $ 12,960