Note 21 - Condensed Consolidating Financial Information Of Guarantor Subsidiaries (Details) - Condensed Consolidating Balance Sheets (USD $) In Thousands, unless otherwise specified	May 31, 2013	May 31, 2012	Aug. 19, 2011	Aug. 17, 2011	May 31, 2011	May 31, 2010
CURRENT ASSETS:
Cash and cash equivalents	$ 29,388	$ 18,578	$ 322,963	$ 322,963	$ 302,603	$ 202,649
Accounts receivable, net	68,086	66,392
Inventories	45,941	33,370
Deferred income tax assets, current portion	5,290	5,489
Prepaid expenses and other current assets	11,577	11,738
Total current assets	160,282	135,567
PROPERTY AND EQUIPMENT, net	76,381	64,662
GOODWILL	1,003,463	966,338
INTANGIBLE ASSETS, net	714,603	735,522
DEFERRED FINANCING COSTS	39,449	38,769
OTHER ASSETS	6,792	8,295
Total assets	2,000,970	1,949,153
CURRENT LIABILITIES:
Accounts payable	13,638	12,734
Accrued expenses and other current liabilities	3,411	1,276
Income taxes payable	3,873	3,654
Deferred revenue, current portion	2,252	2,606
Current portion of long	6,712	3,922
Total current liabilities	73,213	64,272
LONG	1,039,278	986,361
DEFERRED REVENUE	161	431
DEFERRED INCOME TAX LIABILITIES	231,040	245,496
OTHER LONG-TERM LIABILITIES	12,572	15,215
Total liabilities	1,356,264	1,311,775
SHAREHOLDERS' EQUITY:
Total shareholders' equity	644,706	637,378
Total liabilities and shareholders' equity	2,000,970	1,949,153
Successor [Member] | Immucor Inc [Member]
CURRENT ASSETS:
Cash and cash equivalents	6,971	8,093
Accounts receivable, net	26,517	27,542
Intercompany receivable	54,443	46,856
Inventories	18,551	21,697
Deferred income tax assets, current portion	3,098	4,168
Prepaid expenses and other current assets	6,360	6,336
Total current assets	115,940	114,692
PROPERTY AND EQUIPMENT, net	40,124	44,103
INVESTMENT IN SUBSIDIARIES	248,150	162,895
GOODWILL	903,802	903,512
INTANGIBLE ASSETS, net	634,194	682,187
DEFERRED FINANCING COSTS	39,449	38,769
OTHER ASSETS	6,203	7,817
Total assets	1,987,862	1,953,975
CURRENT LIABILITIES:
Accounts payable	7,587	9,816
Intercompany payable	424	190
Accrued expenses and other current liabilities	31,737	31,250
Income taxes payable	30,879	30,719
Deferred revenue, current portion	1,086	1,270
Current portion of long	6,673	3,922
Total current liabilities	78,386	77,167
LONG	1,039,250	986,361
DEFERRED REVENUE	62	391
DEFERRED INCOME TAX LIABILITIES	214,222	238,582
OTHER LONG-TERM LIABILITIES	11,236	14,096
Total liabilities	1,343,156	1,316,597
SHAREHOLDERS' EQUITY:
Total shareholders' equity	644,706	637,378
Total liabilities and shareholders' equity	1,987,862	1,953,975
Successor [Member] | Guarantor [Member]
CURRENT ASSETS:
Cash and cash equivalents	4,107
Accounts receivable, net	5,552	489
Intercompany receivable	7,961	23
Inventories	15,897	1,438
Deferred income tax assets, current portion	1,097	531
Prepaid expenses and other current assets	483	31,227
Total current assets	35,097	33,708
PROPERTY AND EQUIPMENT, net	17,060	1,407
INVESTMENT IN SUBSIDIARIES	5,743
GOODWILL	41,763	6,659
INTANGIBLE ASSETS, net	39,523	10,438
OTHER ASSETS	184	5,558
Total assets	139,370	57,770
CURRENT LIABILITIES:
Accounts payable	3,315	1,145
Intercompany payable	59,347	39,177
Accrued expenses and other current liabilities	5,290	1,421
Income taxes payable	(30,457)
Deferred revenue, current portion	6	20
Current portion of long	39
Total current liabilities	37,540	41,763
LONG	28
DEFERRED INCOME TAX LIABILITIES	4,861
OTHER LONG-TERM LIABILITIES	114
Total liabilities	42,543	41,763
SHAREHOLDERS' EQUITY:
Total shareholders' equity	96,827	16,007
Total liabilities and shareholders' equity	139,370	57,770
Successor [Member] | Non-Guarantors [Member]
CURRENT ASSETS:
Cash and cash equivalents	18,310	10,629
Accounts receivable, net	36,017	38,361
Intercompany receivable	4,313	7,610
Inventories	12,978	10,235
Deferred income tax assets, current portion	533	790
Prepaid expenses and other current assets	4,734	4,784
Total current assets	76,885	72,409
PROPERTY AND EQUIPMENT, net	19,197	19,152
INVESTMENT IN SUBSIDIARIES	4	4
GOODWILL	57,898	56,167
INTANGIBLE ASSETS, net	40,886	42,897
OTHER ASSETS	405	370
Total assets	195,275	190,999
CURRENT LIABILITIES:
Accounts payable	2,736	1,773
Intercompany payable	7,440	15,122
Accrued expenses and other current liabilities	9,711	8,829
Income taxes payable	3,451	3,544
Deferred revenue, current portion	1,160	1,316
Total current liabilities	24,498	30,584
DEFERRED REVENUE	99	40
DEFERRED INCOME TAX LIABILITIES	11,957	12,364
OTHER LONG-TERM LIABILITIES	1,222	1,119
Total liabilities	37,776	44,107
SHAREHOLDERS' EQUITY:
Total shareholders' equity	157,499	146,892
Total liabilities and shareholders' equity	195,275	190,999
Successor [Member] | Eliminations [Member]
CURRENT ASSETS:
Cash and cash equivalents		(144)
Intercompany receivable	(66,717)	(54,489)
Inventories	(1,485)
Deferred income tax assets, current portion	562
Prepaid expenses and other current assets		(30,609)
Total current assets	(67,640)	(85,242)
INVESTMENT IN SUBSIDIARIES	(253,897)	(162,899)
OTHER ASSETS		(5,450)
Total assets	(321,537)	(253,591)
CURRENT LIABILITIES:
Intercompany payable	(67,211)	(54,489)
Accrued expenses and other current liabilities		(144)
Income taxes payable		(30,609)
Total current liabilities	(67,211)	(85,242)
DEFERRED INCOME TAX LIABILITIES		(5,450)
Total liabilities	(67,211)	(90,692)
SHAREHOLDERS' EQUITY:
Total shareholders' equity	(254,326)	(162,899)
Total liabilities and shareholders' equity	(321,537)	(253,591)
Successor [Member] | Total [Member]
CURRENT ASSETS:
Cash and cash equivalents	29,388	18,578
Accounts receivable, net	68,086	66,392
Inventories	45,941	33,370
Deferred income tax assets, current portion	5,290	5,489
Prepaid expenses and other current assets	11,577	11,738
Total current assets	160,282	135,567
PROPERTY AND EQUIPMENT, net	76,381	64,662
GOODWILL	1,003,463	966,338
INTANGIBLE ASSETS, net	714,603	735,522
DEFERRED FINANCING COSTS	39,449	38,769
OTHER ASSETS	6,792	8,295
Total assets	2,000,970	1,949,153
CURRENT LIABILITIES:
Accounts payable	13,638	12,734
Accrued expenses and other current liabilities	46,738	41,356
Income taxes payable	3,873	3,654
Deferred revenue, current portion	2,252	2,606
Current portion of long	6,712	3,922
Total current liabilities	73,213	64,272
LONG	1,039,278	986,361
DEFERRED REVENUE	161	431
DEFERRED INCOME TAX LIABILITIES	231,040	245,496
OTHER LONG-TERM LIABILITIES	12,572	15,215
Total liabilities	1,356,264	1,311,775
SHAREHOLDERS' EQUITY:
Total shareholders' equity	644,706	637,378
Total liabilities and shareholders' equity	2,000,970	1,949,153
Successor [Member]
CURRENT ASSETS:
Inventories	45,941
GOODWILL	1,003,463	966,338
SHAREHOLDERS' EQUITY:
Total shareholders' equity	$ 644,706	$ 637,378