Note 17. Income Taxes (Detail) (USD $)	3 Months Ended	9 Months Ended	12 Months Ended
	Aug. 19, 2011	May 31, 2012	May 31, 2011	May 31, 2010
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate	35.00%	35.00%	35.00%	35.00%
Deferred Tax Assets, Gross		$ (238,119,000)	$ 9,463,000
Deferred Tax Liabilities, Intangible Assets	291,900,000
Deferred Tax Assets, Net		(240,007,000)	6,996,000
Deferred Tax Assets, Operating Loss Carryforwards, Domestic		19,000,000
Deferred Tax Assets, Tax Credit Carryforwards		25,109,000	2,736,000
Deferred Tax Assets, Tax Credit Carryforwards, Research		2,000,000
Valuation Allowance, Deferred Tax Asset, Change in Amount			2,300,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate		4,100,000
Unrecognized Tax Benefits		14,831,000	9,766,000	8,093,000
Offsets Related to Transfer Pricing [Member]
Deferred Tax Assets, Gross		7,800,000	5,400,000
Written Off Due to Net Operating Loss Carryforwards [Member]
Valuation Allowance, Deferred Tax Asset, Change in Amount			3.9
Belgium [Member]
Operating Loss Carryforwards		3,300,000
France [Member]
Operating Loss Carryforwards		2,400,000
Expiring Between 2018 and 2022 [Member]
Deferred Tax Assets, Tax Credit Carryforwards		21,000,000
Non-Current Liability [Member]
Unrecognized Tax Benefits		12,700,000
Non-Current Deferred Tax Assets [Member]
Unrecognized Tax Benefits		2,100,000
Income Taxes Payable [Member]
Unrecognized Tax Benefits			$ 9,800,000