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Components of Net Deferred Taxes and Related Valuation Allowance (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Sep. 30, 2012
--- | --- | ---
Deferred tax assets: |  |
Net operating loss carryforwards | $ 6,760 | $ 8,626
Vacation accrual | 2,580 | 2,586
Pension accrual | 2,672 | 5,201
Allowance for bad debts | 3,158 | 2,845
Fair value of derivative instruments | 2,314 |
Insurance accrual | 21,073 | 18,085
Inventory | 941 | 869
Alternative minimum tax credit carryforward | 261 | 261
Other, net | 1,906 | 2,188
Total deferred tax assets | 41,665 | 40,661
Valuation allowance |  | (658)
Net deferred tax assets | 41,665 | 40,003
Deferred tax liabilities: |  |
Property and equipment | 2,225 | 1,947
Intangibles | 26,285 | 20,164
Fair value of derivative instruments |  | 484
Total deferred tax liabilities | 28,510 | 22,595
Net deferred taxes | $ 13,155 | $ 17,408

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 + Details
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