Employee Benefit Plans - Additional Information (Detail) (USD $)	12 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2009	Jun. 30, 2008
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Employer 401(k) contribution (in percent), maximum	4.00%				2.00%
Provision to matching and discretionary contributions	$ 35,800,000	$ 33,100,000	$ 27,600,000
Maximum matching contribution received by employees, (in percent)				5.00%
Employee stock purchase, maximum withheld of annual employee earning	$ 25,000
Employee stock purchase price, price based on prevailing market price (in percent)	95.00%
Employee stock purchase price, price subsidy by employer (in percent)	5.00%
Employee stock purchase price, shares purchased by employees	48,575	30,289