Note 15 - Condensed Consolidating Financial Information Of Guarantor Subsidiaries (Detail) - Condensed Consolidating Balance Sheets (USD $) In Thousands, unless otherwise specified	Feb. 29, 2012	Aug. 19, 2011	May 31, 2011	Feb. 28, 2011	May 31, 2010
CURRENT ASSETS:
Cash and cash equivalents	$ 28,005	$ 322,963	$ 302,603	$ 274,678	$ 202,649
Accounts receivable, net	67,798		63,324
Inventories	34,745		32,914
Deferred income tax assets, current portion	6,507		15,884
Prepaid expenses and other current assets	5,854		11,164
Total current assets	142,909		425,889
PROPERTY AND EQUIPMENT, Net	65,548		58,216
GOODWILL	960,219		93,767
INTANGIBLE ASSETS, Net	749,367		54,133
DEFERRED FINANCING COSTS	39,986
OTHER ASSETS	682		1,122
Total assets	1,958,711		633,127
CURRENT LIABILITIES:
Accounts payable	11,454		10,790
Accrued expenses and other current liabilities	51,178		20,331
Income taxes payable	11,981		8,294
Deferred revenue, current portion	2,983		7,495
Current portion of long term debt, net of debt discounts	3,960		0
Total current liabilities	81,556		46,910
LONG TERM DEBT, NET OF DEBT DISCOUNTS	987,215		0
DEFERRED REVENUE	501		6,080
DEFERRED INCOME TAX LIABILITIES	245,386		9,264
OTHER LONG-TERM LIABILITIES	2,312		2,001
Total liabilities	1,316,970		64,255
SHAREHOLDERS' EQUITY:
Total shareholders’ equity	641,741		568,872
Total liabilities and shareholders’ equity	1,958,711		633,127
Total [Member] | Predecessor [Member]
CURRENT ASSETS:
Cash and cash equivalents			302,603
Accounts receivable, net			63,324
Inventories			32,914
Deferred income tax assets, current portion			15,884
Prepaid expenses and other current assets			11,164
Total current assets			425,889
PROPERTY AND EQUIPMENT, Net			58,216
GOODWILL			93,767
INTANGIBLE ASSETS, Net			54,133
OTHER ASSETS			1,122
Total assets			633,127
CURRENT LIABILITIES:
Accounts payable			10,790
Accrued expenses and other current liabilities			20,331
Income taxes payable			8,294
Deferred revenue, current portion			7,495
Total current liabilities			46,910
DEFERRED REVENUE			6,080
DEFERRED INCOME TAX LIABILITIES			9,264
OTHER LONG-TERM LIABILITIES			2,001
Total liabilities			64,255
SHAREHOLDERS' EQUITY:
Total shareholders’ equity			568,872
Total liabilities and shareholders’ equity			633,127
Total [Member] | Successor [Member]
CURRENT ASSETS:
Cash and cash equivalents	28,005
Accounts receivable, net	67,798
Inventories	34,745
Deferred income tax assets, current portion	6,507
Prepaid expenses and other current assets	5,854
Total current assets	142,909
PROPERTY AND EQUIPMENT, Net	65,548
GOODWILL	960,219
INTANGIBLE ASSETS, Net	749,367
DEFERRED FINANCING COSTS	39,986
OTHER ASSETS	682
Total assets	1,958,711
CURRENT LIABILITIES:
Accounts payable	11,454
Accrued expenses and other current liabilities	51,178
Income taxes payable	11,981
Deferred revenue, current portion	2,983
Current portion of long term debt, net of debt discounts	3,960
Total current liabilities	81,556
LONG TERM DEBT, NET OF DEBT DISCOUNTS	987,215
DEFERRED REVENUE	501
DEFERRED INCOME TAX LIABILITIES	245,386
OTHER LONG-TERM LIABILITIES	2,312
Total liabilities	1,316,970
SHAREHOLDERS' EQUITY:
Total shareholders’ equity	641,741
Total liabilities and shareholders’ equity	1,958,711
Corporate Elimination [Member] | Predecessor [Member]
CURRENT ASSETS:
Cash and cash equivalents			(80)
Intercompany receivable			(6,235)
Prepaid expenses and other current assets			(24,554)
Total current assets			(30,869)
INVESTMENT IN SUBSIDIARIES			(247,576)
DEFERRED INCOME TAX ASSETS			(1,869)
OTHER ASSETS			376
Total assets			(279,938)
CURRENT LIABILITIES:
Accounts payable			(80)
Intercompany payable			(37,686)
Income taxes payable			(24,554)
Total current liabilities			(62,320)
DEFERRED INCOME TAX LIABILITIES			(1,493)
Total liabilities			(63,813)
SHAREHOLDERS' EQUITY:
Total shareholders’ equity			(216,125)
Total liabilities and shareholders’ equity			(279,938)
Corporate Elimination [Member] | Successor [Member]
CURRENT ASSETS:
Cash and cash equivalents	(144)
Intercompany receivable	(8,175)
Prepaid expenses and other current assets	(30,017)
Total current assets	(38,336)
INVESTMENT IN SUBSIDIARIES	(447,302)
OTHER ASSETS	(5,731)
Total assets	(491,369)
CURRENT LIABILITIES:
Intercompany payable	(44,836)
Income taxes payable	(30,017)
Total current liabilities	(74,853)
DEFERRED INCOME TAX LIABILITIES	(5,731)
Total liabilities	(80,584)
SHAREHOLDERS' EQUITY:
Total shareholders’ equity	(410,785)
Total liabilities and shareholders’ equity	(491,369)
Non-Guarantors [Member] | Predecessor [Member]
CURRENT ASSETS:
Cash and cash equivalents			52,297
Accounts receivable, net			37,033
Intercompany receivable			5,925
Inventories			10,905
Deferred income tax assets, current portion			300
Prepaid expenses and other current assets			2,100
Total current assets			108,560
PROPERTY AND EQUIPMENT, Net			18,259
INVESTMENT IN SUBSIDIARIES			5
GOODWILL			22,821
INTANGIBLE ASSETS, Net			7,388
DEFERRED INCOME TAX ASSETS			178
OTHER ASSETS			647
Total assets			157,858
CURRENT LIABILITIES:
Accounts payable			3,083
Intercompany payable			11,829
Accrued expenses and other current liabilities			8,939
Income taxes payable			3,813
Deferred revenue, current portion			2,686
Total current liabilities			30,350
DEFERRED REVENUE			1,875
DEFERRED INCOME TAX LIABILITIES			784
OTHER LONG-TERM LIABILITIES			1,224
Total liabilities			34,233
SHAREHOLDERS' EQUITY:
Total shareholders’ equity			123,625
Total liabilities and shareholders’ equity			157,858
Non-Guarantors [Member] | Successor [Member]
CURRENT ASSETS:
Cash and cash equivalents	13,559
Accounts receivable, net	40,020
Intercompany receivable	7,608
Inventories	10,060
Deferred income tax assets, current portion	394
Prepaid expenses and other current assets	2,865
Total current assets	74,506
PROPERTY AND EQUIPMENT, Net	20,376
INVESTMENT IN SUBSIDIARIES	4
GOODWILL	264,492
INTANGIBLE ASSETS, Net	88,470
OTHER ASSETS	365
Total assets	448,213
CURRENT LIABILITIES:
Accounts payable	3,042
Intercompany payable	7,501
Accrued expenses and other current liabilities	9,145
Income taxes payable	4,481
Deferred revenue, current portion	1,405
Total current liabilities	25,574
DEFERRED REVENUE	58
DEFERRED INCOME TAX LIABILITIES	28,515
OTHER LONG-TERM LIABILITIES	1,215
Total liabilities	55,362
SHAREHOLDERS' EQUITY:
Total shareholders’ equity	392,851
Total liabilities and shareholders’ equity	448,213
Guarantor [Member] | Predecessor [Member]
CURRENT ASSETS:
Accounts receivable, net			377
Inventories			1,253
Deferred income tax assets, current portion			4,466
Prepaid expenses and other current assets			24,895
Total current assets			30,991
PROPERTY AND EQUIPMENT, Net			856
GOODWILL			53,143
INTANGIBLE ASSETS, Net			45,695
OTHER ASSETS			99
Total assets			130,784
CURRENT LIABILITIES:
Accounts payable			1,463
Intercompany payable			25,227
Accrued expenses and other current liabilities			1,568
Deferred revenue, current portion			31
Total current liabilities			28,289
DEFERRED REVENUE			22
DEFERRED INCOME TAX LIABILITIES			9,973
Total liabilities			38,284
SHAREHOLDERS' EQUITY:
Total shareholders’ equity			92,500
Total liabilities and shareholders’ equity			130,784
Guarantor [Member] | Successor [Member]
CURRENT ASSETS:
Accounts receivable, net	547
Intercompany receivable	94
Inventories	1,540
Deferred income tax assets, current portion	219
Prepaid expenses and other current assets	30,567
Total current assets	32,967
PROPERTY AND EQUIPMENT, Net	1,139
GOODWILL	6,659
INTANGIBLE ASSETS, Net	10,519
OTHER ASSETS	5,839
Total assets	57,123
CURRENT LIABILITIES:
Accounts payable	939
Intercompany payable	37,056
Accrued expenses and other current liabilities	1,179
Deferred revenue, current portion	15
Total current liabilities	39,189
Total liabilities	39,189
SHAREHOLDERS' EQUITY:
Total shareholders’ equity	17,934
Total liabilities and shareholders’ equity	57,123
Immucor Inc [Member] | Predecessor [Member]
CURRENT ASSETS:
Cash and cash equivalents			250,386
Accounts receivable, net			25,914
Intercompany receivable			310
Inventories			20,756
Deferred income tax assets, current portion			11,118
Prepaid expenses and other current assets			8,723
Total current assets			317,207
PROPERTY AND EQUIPMENT, Net			39,101
INVESTMENT IN SUBSIDIARIES			247,571
GOODWILL			17,803
INTANGIBLE ASSETS, Net			1,050
DEFERRED INCOME TAX ASSETS			1,691
Total assets			624,423
CURRENT LIABILITIES:
Accounts payable			6,324
Intercompany payable			630
Accrued expenses and other current liabilities			9,824
Income taxes payable			29,035
Deferred revenue, current portion			4,778
Total current liabilities			50,591
DEFERRED REVENUE			4,183
OTHER LONG-TERM LIABILITIES			777
Total liabilities			55,551
SHAREHOLDERS' EQUITY:
Total shareholders’ equity			568,872
Total liabilities and shareholders’ equity			624,423
Immucor Inc [Member] | Successor [Member]
CURRENT ASSETS:
Cash and cash equivalents	14,590
Accounts receivable, net	27,231
Intercompany receivable	473
Inventories	23,145
Deferred income tax assets, current portion	5,894
Prepaid expenses and other current assets	2,439
Total current assets	73,772
PROPERTY AND EQUIPMENT, Net	44,033
INVESTMENT IN SUBSIDIARIES	447,298
GOODWILL	689,068
INTANGIBLE ASSETS, Net	650,378
DEFERRED FINANCING COSTS	39,986
OTHER ASSETS	209
Total assets	1,944,744
CURRENT LIABILITIES:
Accounts payable	7,473
Intercompany payable	279
Accrued expenses and other current liabilities	40,854
Income taxes payable	37,517
Deferred revenue, current portion	1,563
Current portion of long term debt, net of debt discounts	3,960
Total current liabilities	91,646
LONG TERM DEBT, NET OF DEBT DISCOUNTS	987,215
DEFERRED REVENUE	443
DEFERRED INCOME TAX LIABILITIES	222,602
OTHER LONG-TERM LIABILITIES	1,097
Total liabilities	1,303,003
SHAREHOLDERS' EQUITY:
Total shareholders’ equity	641,741
Total liabilities and shareholders’ equity	1,944,744
Predecessor [Member]
CURRENT ASSETS:
Inventories			32,914
GOODWILL		94,065	93,767
SHAREHOLDERS' EQUITY:
Total shareholders’ equity		576,646	568,872
Successor [Member]
CURRENT ASSETS:
Inventories	34,745
GOODWILL	960,219	0
SHAREHOLDERS' EQUITY:
Total shareholders’ equity	$ 641,741