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Segment and Related Information - Schedule of Total Operating Income for Continuing Reportable Segments (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Total operating income for reportable segments	$ 36,342us-gaap_OperatingIncomeLoss	$ 82,999us-gaap_OperatingIncomeLoss	$ 62,262us-gaap_OperatingIncomeLoss	$ 165,903us-gaap_OperatingIncomeLoss
Interest income	85us-gaap_InvestmentIncomeInterest	1,330us-gaap_InvestmentIncomeInterest	140us-gaap_InvestmentIncomeInterest	2,691us-gaap_InvestmentIncomeInterest
Other	1,513us-gaap_OtherNonoperatingIncomeExpense	(185)us-gaap_OtherNonoperatingIncomeExpense	1,416us-gaap_OtherNonoperatingIncomeExpense	(623)us-gaap_OtherNonoperatingIncomeExpense
Income tax provision	13,909us-gaap_IncomeTaxExpenseBenefit	33,784us-gaap_IncomeTaxExpenseBenefit	23,805us-gaap_IncomeTaxExpenseBenefit	62,146us-gaap_IncomeTaxExpenseBenefit
Net income	$ 24,031us-gaap_NetIncomeLoss	$ 50,360us-gaap_NetIncomeLoss	$ 40,013us-gaap_NetIncomeLoss	$ 105,825us-gaap_NetIncomeLoss

X

- Definition

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

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- Definition

Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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