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Income Taxes - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014
Income Taxes [Line Items]
Income tax expense	$ 14,091us-gaap_IncomeTaxExpenseBenefit	$ 20,573us-gaap_IncomeTaxExpenseBenefit	$ 37,896us-gaap_IncomeTaxExpenseBenefit	$ 82,719us-gaap_IncomeTaxExpenseBenefit
Approximate rate on pre-tax income	40.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations	36.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations	38.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations	37.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations
U.S. federal statutory rate	35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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