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Components of Net Deferred Taxes (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Sep. 30, 2018
Deferred tax assets:
Net operating loss carryforwards	$ 6,292	$ 6,647
Vacation accrual	2,774	2,658
Pension accrual	4,504	4,425
Allowance for bad debts	2,235	2,226
Insurance accrual	2,419	2,425
Inventory capitalization	247	350
Fair value of derivative instruments	2,794
Other, net		1,382
Total deferred tax assets	21,265	20,113
Valuation allowance	(4,003)	(3,980)
Net deferred tax assets	17,262	16,133
Deferred tax liabilities:
Property and equipment	13,485	9,783
Fair value of derivative instruments		4,673
Intangibles	21,883	22,883
Other, net	2,010
Total deferred tax liabilities	37,378	37,339
Net deferred tax liabilities	$ (20,116)	$ (21,206)

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