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Components of Net Deferred Taxes (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Sep. 30, 2016
Deferred tax assets:    
Net operating loss carryforwards $ 5,374 $ 5,791
Vacation accrual 3,542 3,367
Pension accrual 7,455 8,549
Allowance for bad debts 2,166 1,728
Insurance accrual 19,914 25,828
Inventory capitalization 895 1,128
Alternative minimum tax credit carryforward   266
Other, net 2,242 2,512
Total deferred tax assets 41,588 49,169
Valuation allowance (3,168) (3,053)
Net deferred tax assets 38,420 46,116
Deferred tax liabilities:    
Property and equipment 8,001 3,999
Fair value of derivative instruments 1,683 788
Intangibles 34,876 35,976
Total deferred tax liabilities 44,560 40,763
Net deferred tax assets   $ 5,353
Net deferred tax liabilities $ (6,140)