Quarterly report pursuant to Section 13 or 15(d)

Income Taxes (Details)

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Income Taxes (Details) (USD $)
3 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Income before income taxes $ 176,542,000 $ 247,262,000
Provision for income taxes 41,175,000 55,267,000
Effective tax rate 23.30% 22.40%
Estimated effective tax rate for the fiscal year ending June 30, 2013 24.70%  
Income Tax Expense, Effective Rate Comparison Decrease, Tax Credits, Research   2,700,000
Potential unrecognized tax benefits during next 12 months 1,700,000  
Non-deductible Decrease In Assets Held
   
Income Tax Reconciliation, Tax Exempt Income $ 1,800,000