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Schedule of Total Operating Income for Continuing Reportable Segments (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2014
Mar. 31, 2013
Segment Reporting Information [Line Items]        
Total operating income for reportable segments $ 55,287 $ 57,918 $ 221,188 $ 162,086
Interest income 2,498 1,434 5,190 4,187
Other (442) (111) (1,066) (224)
Income tax provision 20,573 21,349 82,719 62,984
Net income $ 36,770 $ 37,892 $ 142,593 $ 103,065