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Income Taxes (Tables) | 12 Months Ended
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Sep. 30, 2017
Income Taxes [Abstract] |
Schedule Of Deferred Income Tax Liabilities And Assets |
﻿ |  |  |  |  |  |
﻿ |  |  |  |  |  |
﻿ |  | 2017 |  | 2016
﻿Deferred tax liabilities: |  |  |  |  |  |
﻿Property and equipment tax/book differences |  | $ | 89,089,000 |  | $ | 88,465,000
﻿Property tax method |  |  | 1,575,000 |  |  | 1,501,000
﻿Total deferred tax liabilities |  |  | 90,664,000 |  |  | 89,966,000
﻿Deferred tax assets: |  |  |  |  |  |
﻿Insurance reserves |  |  | 7,872,000 |  |  | 8,390,000
﻿Advance payments on purchases contracts |  |  | 1,207,000 |  |  | 618,000
﻿Vacation accrual |  |  | 2,471,000 |  |  | 2,520,000
﻿State tax credits |  |  | 4,000 |  |  | 20,000
﻿Inventory |  |  | 1,555,000 |  |  | 1,720,000
﻿Deferred compensation |  |  | 5,032,000 |  |  | 4,062,000
﻿Other |  |  | 2,605,000 |  |  | 1,187,000
﻿Total deferred tax assets |  |  | 20,746,000 |  |  | 18,517,000
﻿Net deferred tax liabilities |  | $ | 69,918,000 |  | $ | 71,449,000
﻿
Schedule Of Income Tax Expense Reconciliation |
﻿ |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |
﻿ |  | 2017 |  | 2016 |  | 2015
﻿ |  |  |  |  |  |  |  |  |
﻿Federal tax at statutory rate |  | $ | 29,492,000 |  | $ | 29,622,000 |  | $ | 33,060,000
﻿State income tax, net of federal tax benefits |  |  | 2,774,000 |  |  | 2,554,000 |  |  | 4,599,000
﻿Federal tax credits |  |  | (1,024,000) |  |  | (1,312,000) |  |  | (1,544,000)
﻿Other |  |  | (854,000) |  |  | (419,000) |  |  | (1,010,000)
﻿Total |  | $ | 30,388,000 |  | $ | 30,445,000 |  | $ | 35,105,000
﻿
Schedule Of Income Tax Expense (Benefit) |
﻿ |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |
﻿ |  | 2017 |  | 2016 |  | 2015
﻿ |  |  |  |  |  |  |  |  |
﻿Current: |  |  |  |  |  |  |  |  |
﻿Federal |  | $ | 26,994,000 |  | $ | 19,676,000 |  | $ | 25,578,000
﻿State |  |  | 4,925,000 |  |  | 3,963,000 |  |  | 7,302,000
﻿Total current |  |  | 31,919,000 |  |  | 23,639,000 |  |  | 32,880,000
﻿Deferred: |  |  |  |  |  |  |  |  |
﻿Federal |  |  | (1,104,000) |  |  | 6,828,000 |  |  | 2,373,000
﻿State |  |  | (427,000) |  |  | (22,000) |  |  | (148,000)
﻿Total deferred |  |  | (1,531,000) |  |  | 6,806,000 |  |  | 2,225,000
﻿Total expense |  | $ | 30,388,000 |  | $ | 30,445,000 |  | $ | 35,105,000
﻿

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- Definition Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32639-109319 + Details
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- Definition Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32537-109319 + Details
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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32687-109319 + Details
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