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Income Taxes (Tables)

12 Months Ended

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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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

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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.

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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.

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Tabular disclosure of the change in unrecognized tax benefits.

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