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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) |

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