Income Taxes - Additional Information (Detail) (USD $)	12 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2009
Income Tax Contingency [Line Items]
Net operating loss carryforward expiration date	2032-06-30
Deferred tax asset, valuation allowances established	$ 9,376,000	$ 6,852,000	$ 6,852,000
Cumulative undistributed earnings attributable to international operations	414,000,000	332,300,000
Effective tax rate	30.90%	33.10%	32.10%
Total amount of gross unrecognized tax benefits for uncertain tax positions, including positions impacting timing of tax benefits	22,000,000	11,900,000	7,100,000	2,200,000
Amount of unrecognized tax benefits that, if recognized, would impact effective tax rate	13,300,000	11,900,000
Expected decrease in unrecognized tax benefits	11,800,000
Total amount of interest and penalties accrued	1,900,000	1,000,000	700,000
Interest and penalties accrued recognized	900,000	300,000	200,000
Canada
Income Tax Contingency [Line Items]
Deferred tax asset, valuation allowances established	6,500,000	6,500,000
Certain state
Income Tax Contingency [Line Items]
Deferred tax asset, valuation allowances established	$ 2,900,000	$ 300,000
Medical and Healthcare
Income Tax Contingency [Line Items]
Income tax holiday termination year	2043
Veterinary school
Income Tax Contingency [Line Items]
Income tax holiday termination year	2023