Note 18 - Income Taxes (Details) (USD $)	3 Months Ended	9 Months Ended	12 Months Ended
	Aug. 19, 2011	May 31, 2012	May 31, 2014	May 31, 2013
Note 18 - Income Taxes (Details) [Line Items]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	35.00%	35.00%	35.00%	35.00%
Deferred Tax Assets, Net			$ (215,111,000)	$ (225,928,000)
Unrecognized Tax Benefits		13,597,000	10,399,000	10,178,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate			14,200,000
Unrecognized Tax Benefits, Interest on Income Taxes Accrued			1,600,000	1,300,000
Unrecognized Tax Benefits, Interest on Income Taxes Expense			300,000	100,000
Successor [Member]
Note 18 - Income Taxes (Details) [Line Items]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent		35.00%
Unrecognized Tax Benefits, Interest on Income Taxes Expense		300,000
Including Accrued Interest [Member]
Note 18 - Income Taxes (Details) [Line Items]
Unrecognized Tax Benefits			14,500,000
Predecessor [Member]
Note 18 - Income Taxes (Details) [Line Items]
Unrecognized Tax Benefits, Interest on Income Taxes Expense	100,000
Offsets Related to Transfer Pricing [Member]
Note 18 - Income Taxes (Details) [Line Items]
Other Assets, Current			6,700,000	6,200,000
Domestic Tax Authority [Member]
Note 18 - Income Taxes (Details) [Line Items]
Operating Loss Carryforwards			8,700,000
Foreign Tax Authority [Member]
Note 18 - Income Taxes (Details) [Line Items]
Operating Loss Carryforwards			25,700,000
Outside United States[Member]
Note 18 - Income Taxes (Details) [Line Items]
Deferred Tax Assets, Net			10,700,000	10,900,000
BELGIUM
Note 18 - Income Taxes (Details) [Line Items]
Operating Loss Carryforwards			3,400,000
FRANCE
Note 18 - Income Taxes (Details) [Line Items]
Operating Loss Carryforwards			1,200,000
Non-current Liability [Member]
Note 18 - Income Taxes (Details) [Line Items]
Unrecognized Tax Benefits			10,400,000	10,200,000
Non-current Deferred Tax Liabilities [Member]
Note 18 - Income Taxes (Details) [Line Items]
Unrecognized Tax Benefits			4,100,000	3,800,000
Immucor Inc [Member]
Note 18 - Income Taxes (Details) [Line Items]
Deferred Tax Liabilities, Intangible Assets			291,900,000
LIFECODES [Member]
Note 18 - Income Taxes (Details) [Line Items]
Deferred Tax Liabilities, Intangible Assets			12,700,000
Organ-i [Member]
Note 18 - Income Taxes (Details) [Line Items]
Deferred Tax Liabilities, Intangible Assets			10,200,000
Research Tax Credit Carryforward [Member]
Note 18 - Income Taxes (Details) [Line Items]
Tax Credit Carryforward, Amount			$ 4,100,000