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Note 6 - Income Taxes (Tables)

12 Months Ended

Apr. 30, 2014

Income Tax Disclosure [Abstract]

Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]

		Years ended April 30,
		2014				2013				2012
Current tax expense
Federal		$	44,078			$	23,519			$	9,937
State			5,657				4,455				2,345
			49,735				27,974				12,282
Deferred tax expense			22,283				36,530				54,442
Total income tax provision		$	72,018			$	64,504			$	66,724

Schedule of Deferred Tax Assets and Liabilities [Table Text Block]

		As of April 30,
		2014				2013
Deferred tax assets
Accrued liabilities		$	11,878			$	9,916
Deferred compensation			6,272				6,050
Equity compensation			3,598				916
Unrecognized tax benefits			3,113				3,128
State net operating losses and tax credits			2,892				3,902
Other			124				100
Total gross deferred tax assets			27,877				24,012
Less valuation allowance			(91	)			—
Total net deferred tax assets			27,786				24,012
Deferred tax liabilities
Property and equipment depreciation			(318,565	)			(295,951	)
Goodwill			(14,989	)			(11,919	)
Other			(307	)			66
Total gross deferred tax liabilities			(333,861	)			(307,804	)
Net deferred tax liability		$	(306,075	)		$	(283,792	)

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

		Years ended April 30,
		2014				2013				2012
Income taxes at the statutory rates			35.0%				35.0%				35.0%
Federal tax credits			-1.9				-1.7				-2.1
State income taxes, net of federal tax benefit			3.3				2.6				2.9
Out of period adjustments			-1.3				—				—
Other			-0.2				0.9				0.6
			34.9%				36.8%				36.4%

Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]

		2014				2013
Beginning balance		$	8,938			$	7,538
Additions based on tax positions related to current year			1,229				2,807
Additions for tax positions of prior years			415				—
Reductions for tax positions of prior years			—				(37	)
Reductions due to lapse of applicable statute of limitations			(1,338	)			(1,370	)
Settlements			—				—
Ending balance		$	9,244			$	8,938

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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.

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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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