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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 9 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2015
Mar. 31, 2014
Segment Reporting Information [Line Items]        
Total operating income for reportable segments $ 35,740us-gaap_OperatingIncomeLoss $ 55,287us-gaap_OperatingIncomeLoss $ 98,002us-gaap_OperatingIncomeLoss $ 221,188us-gaap_OperatingIncomeLoss
Interest income 124us-gaap_InvestmentIncomeInterest 2,498us-gaap_InvestmentIncomeInterest 265us-gaap_InvestmentIncomeInterest 5,190us-gaap_InvestmentIncomeInterest
Other (298)us-gaap_OtherNonoperatingIncomeExpense (442)us-gaap_OtherNonoperatingIncomeExpense 1,117us-gaap_OtherNonoperatingIncomeExpense (1,066)us-gaap_OtherNonoperatingIncomeExpense
Income tax provision 14,091us-gaap_IncomeTaxExpenseBenefit 20,573us-gaap_IncomeTaxExpenseBenefit 37,896us-gaap_IncomeTaxExpenseBenefit 82,719us-gaap_IncomeTaxExpenseBenefit
Net income $ 21,475us-gaap_NetIncomeLoss $ 36,770us-gaap_NetIncomeLoss $ 61,488us-gaap_NetIncomeLoss $ 142,593us-gaap_NetIncomeLoss