Components of Net Deferred Taxes (Detail) - USD ($) $ in Thousands	Sep. 30, 2025	Sep. 30, 2024
Deferred tax assets:
Operating lease liabilities	$ 26,907	$ 26,534
Net operating loss carryforwards	404	2,516
Vacation accrual	2,748	2,785
Pension accrual	3,550	3,507
Allowance for bad debts	1,915	1,687
Insurance accrual	1,682	1,628
Fair value of derivative instruments	432	4,261
Other, net	328	350
Total deferred tax assets	37,966	43,268
Valuation allowance	(118)	(2,109)
Net deferred tax assets	37,848	41,159
Deferred tax liabilities:
Operating lease right-of-use assets	25,833	25,257
Property and equipment	18,032	14,502
Intangibles	21,669	20,152
Other, net	3,137	3,170
Total deferred tax liabilities	68,671	63,081
Net deferred taxes	$ (30,823)	$ (21,922)