Note 2 - Business Combinations (Details) (USD $)	12 Months Ended			3 Months Ended			0 Months Ended		0 Months Ended	12 Months Ended			0 Months Ended		0 Months Ended	3 Months Ended	12 Months Ended				0 Months Ended
	May 31, 2014	May 31, 2013	May 31, 2012	Aug. 19, 2011 Predecessor [Member] General and Administrative Expense [Member] Paid Prior to Closing [Member] Immucor Inc [Member]	Aug. 19, 2011 Predecessor [Member] General and Administrative Expense [Member] Immucor Inc [Member]	Aug. 19, 2011 Predecessor [Member]	Jan. 31, 2014 UNITED KINGDOM LIFECODES [Member]	Jan. 31, 2014 UNITED KINGDOM LIFECODES [Member]	Jan. 31, 2014 ITALY LIFECODES [Member]	May 31, 2013 Contingent Consideration [Member] LIFECODES [Member]	Mar. 22, 2013 Deferred Financing Costs [Member] LIFECODES [Member]	Aug. 19, 2011 Deferred Financing Costs [Member] Immucor Inc [Member]	May 30, 2014 Organ-i [Member]	May 30, 2014 Organ-i [Member]	Mar. 22, 2013 LIFECODES [Member]	Aug. 31, 2013 LIFECODES [Member]	May 31, 2014 LIFECODES [Member]	May 31, 2013 LIFECODES [Member]	Jan. 31, 2014 LIFECODES [Member]	Mar. 22, 2013 LIFECODES [Member]	Aug. 19, 2011 Immucor Inc [Member]	Aug. 19, 2011 Immucor Inc [Member]	Mar. 22, 2013 In Process Research and Development [Member]
Note 2 - Business Combinations (Details) [Line Items]
Payments to Acquire Businesses, Gross													$ 12,000,000		$ 86,204,000			$ 87,300,000
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High														18,000,000						10,000,000
Business Combination, Contingent Consideration, Liability	11,300,000	4,504,000												11,300,000			0	4,500,000		4,400,000
Business Combination, Consideration Transferred							4,000,000		2,400,000				23,300,000		90,604,000						1,939,387,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill														26,700,000					3,500,000	33,240,000		779,860,000
Goodwill	851,563,000	1,003,463,000	966,338,000											5,800,000					1,100,000	36,889,000		972,295,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Noncurrent														9,100,000						12,700,000		291,900,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents								1,200,000												2,558,000		322,963,000
Proceeds from Previous Acquisition																1,100,000
Accretion Expense										100,000
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability	(4,638,000)	104,000															(4,600,000)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles																				31,800,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets																							1,400,000
Other Borrowings																				50,000,000
Proceeds from Contributions from Parent															42,500,000
Proceeds from Contributions from Affiliates															39,000,000
Business Acquisition, Transaction Costs											1,600,000	42,500,000								4,200,000		88,300,000
Other Additional Capital																				2,100,000
Business Combination, Acquisition Related Costs	(4,638,000)	2,616,000		2,000,000	16,900,000	18,863,000												2,600,000			28,900,000
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual																		9,500,000
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual																		$ 2,600,000