Stock-Based Compensation - Additional Information (Detail) (USD $)	12 Months Ended			3 Months Ended	12 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2012 Out of Period Adjustment	Jun. 30, 2012 Employee Stock Option Maximum Year	Jun. 30, 2012 Stock Incentive Plans	Jun. 30, 2012 Stock Option Plans	Jun. 30, 2011 Stock Option Plans	Jun. 30, 2010 Stock Option Plans	Jun. 30, 2012 Restricted Stock	Jun. 30, 2012 Restricted Stock Maximum	Jun. 30, 2012 Restricted Stock Minimum	Jun. 30, 2012 Performance Based Shares	Jun. 30, 2012 Non-Performance Based Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option term					10
Stock incentives granted, vesting period, in years					5 years						4 years	3 years	3 years
Common stock, authorized and unissued, reserved for future issuance						7,026,324
Total intrinsic value of options exercised	$ 4,200,000	$ 7,500,000	$ 16,800,000
Weighted average estimated grant date fair values, for options granted at market price, per share							$ 17.31	$ 16.53	$ 23.11
Grant of restricted stock to selected employees and non-employee directors	472,525									324,690			64,710	259,980
Stock compensation expense				2,000,000
Total pre-tax unrecognized compensation costs related to non-vested awards	22,200,000
Total pre-tax unrecognized compensation costs related to non-vested awards expected to be recognized, years	2 years 4 months 24 days
Total fair value of options vested	9,200,000	7,200,000	6,600,000
Capitalized stock-based compensation costs	$ 0	$ 0