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Income Taxes (Tables) | 12 Months Ended
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Apr. 30, 2013
Income Taxes [Abstract] |
Components Of Income Tax Expense Attributable To Earnings |
|  | Years ended April 30,
|  | 2013 |  | 2012 |  | 2011
Current tax expense |  |  |  |  |  |
Federal | $ | 23,519 | $ | 9,937 | $ | (6,171)
State |  | 4,455 |  | 2,345 |  | 1,871
|  | 27,974 |  | 12,282 |  | (4,300)
Deferred tax expense |  | 36,530 |  | 54,442 |  | 60,914
Total income tax provision | $ | 64,504 | $ | 66,724 | $ | 56,614
Schedule of Deferred Tax Assets and Liabilities |
|  | As of April 30,
|  | 2013 |  | 2012 |  | 2011
Deferred tax assets |  |  |  |  |  |
Accrued liabilities | $ | 9,916 | $ | 13,143 | $ | 10,405
Deferred compensation |  | 6,050 |  | 5,663 |  | 5,325
Unrecognized tax benefits |  | 3,128 |  | 2,638 |  | 2,135
State net operating loss |  | 3,902 |  | 4,395 |  | 2,771
Other |  | 1,016 |  | 611 |  | 656
Total gross deferred tax assets |  | 24,012 |  | 26,450 |  | 21,292
Deferred tax liabilities |  |  |  |  |  |
Excess of tax over book |  |  |  |  |  |
depreciation |  | (295,951) |  | (264,757) |  | (211,415)
Goodwill |  | (11,919) |  | (8,955) |  | (2,550)
Other |  | 66 |  | - |  | -
Total gross deferred tax |  |  |  |  |  |
liabilities |  | (307,804) |  | (273,712) |  | (213,965)
Net deferred tax liability | $ | (283,792) | $ | (247,262) | $ | (192,673)
Schedule of Effective Income Tax Rate Reconciliation |
|  | Years ended April 30,
|  | 2013 |  | 2012 |  | 2011
Income taxes at the statutory rates |  | 35.0% |  | 35.0% |  | 35.0%
Federal tax credits |  | -1.7 |  | -2.1 |  | -1.2
State income taxes, net of federal tax |  |  |  |  |  |
benefit |  | 2.6 |  | 2.9 |  | 2.9
Other |  | 0.9 |  | 0.6 |  | 0.7
|  | 36.8% |  | 36.4% |  | 37.4%
Reconciliation Of Unrecognized Tax Benefits |
|  | 2013 |  | 2012
Beginning balance | $ | 7,538 | $ | 6,148
Additions based on tax positions related to current year |  | 2,807 |  | 2,706
Additions for tax positions of prior years |  | - |  | 142
Reductions for tax positions of prior years |  | (37) |  | (47)
Reductions due to lapse of applicable statute of limitations |  | (1,370) |  | (1,411)
Settlements |  | - |  | -
Ending balance | $ | 8,938 | $ | 7,538

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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=6907707&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=6907707&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=6907707&loc=d3e32687-109319 + Details
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- Definition Tabular disclosure of the change in unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 55 -Paragraph 217 -URI http://asc.fasb.org/extlink&oid=21917533&loc=d3e36027-109320 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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