Income Taxes (Tables)

12 Months Ended

Apr. 30, 2015

Schedule of Components of Income Tax Expense (Benefit)

Income tax expense attributable to earnings consisted of the following components:



	Years ended April 30,
	2015		2014		2013
Current tax expense
Federal	$	49,593	$	44,078	$	23,519
State	7,093		5,657		4,455
	56,686		49,735		27,974
Deferred tax expense	44,711		17,089		31,828
Total income tax expense	$	101,397	$	66,824	$	59,802

Schedule of Deferred Tax Assets and Liabilities

The tax effects of temporary differences that gave rise to significant portions of the deferred tax assets and deferred tax liabilities were as follows:



	As of April 30,
	2015			2014
Deferred tax assets
Accrued liabilities and reserves	$	8,593		$	16,830
Property and equipment depreciation	12,846			11,788
Workers compensation	9,536			8,501
Deferred compensation	6,653			6,272
Equity compensation	3,767			3,598
State net operating losses & tax credits	626			2,757
Other	1,787			3,265
Total gross deferred tax assets	43,808			53,011
Less valuation allowance	228			—
Total net deferred tax assets	43,580			53,011
Deferred tax liabilities
Property and equipment depreciation	(363,965		)	(332,095		)
Goodwill	(18,319		)	(14,989		)
Other	(738		)	(658		)
Total gross deferred tax liabilities	(383,022		)	(347,742		)
Net deferred tax liability	$	(339,442	)	$	(294,731	)

Schedule of Effective Income Tax Rate Reconciliation

Out of period adjustments of $2,760 were recorded in fiscal 2014.



	Years ended April 30,
	2015		2014		2013
Income taxes at the statutory rates	35.0	%	35.0	%	35.0	%
Federal tax credits	(1.7	)%	(2.1	)%	(1.8	)%
State income taxes, net of federal tax benefit	3.1	%	3.2	%	2.4	%
Out of period adjustments	—	%	(1.4	)%	—	%
Other	(0.4	)%	(0.2	)%	1.0	%
	36.0	%	34.5	%	36.6	%

Schedule of Unrecognized Tax Benefits

A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows:



	2015			2014
Beginning balance	$	9,244		$	8,938
Additions based on tax positions related to current year	1,186			1,229
Additions for tax positions of prior years	13			415
Reductions for tax positions of prior years	—			—
Reductions due to lapse of applicable statute of limitations	(2,400		)	(1,338		)
Settlements	—			—
Ending balance	$	8,043		$	9,244