Note 15 - Condensed Consolidating Financial Information Of Guarantor Subsidiary (Detail) - Condensed Consolidating Cash Flow Information (USD $) In Thousands, unless otherwise specified	0 Months Ended	3 Months Ended
	Aug. 31, 2011	Aug. 31, 2012	Aug. 19, 2011	May 31, 2012	May 31, 2011
Net cash provided by (used in) operating activities	$ (13,113)	$ (10,244)	$ 25,588
Net cash used in investing activities	(1,940,294)	(2,167)	(2,265)
Net cash provided by ( used in) financing activities	1,655,564	11,935	66
Effect of exchange rate changes on cash and cash equivalents	14	41	(3,029)
Increase (decrease) in cash and cash equivalents	(297,829)	(435)	20,360
Cash and cash equivalents	25,134	18,143	322,963	18,578	302,603
Immucor Inc [Member] | Successor [Member] | Beginning Balance [Member]
Cash and cash equivalents	314,304
Immucor Inc [Member] | Successor [Member] | Ending Balance [Member]
Cash and cash equivalents		1,871
Immucor Inc [Member] | Successor [Member]
Net cash provided by (used in) operating activities		(16,702)
Net cash used in investing activities		(1,454)
Net cash provided by ( used in) financing activities		11,934
Increase (decrease) in cash and cash equivalents		(6,222)
Immucor Inc [Member] | Predecessor [Member] | Beginning Balance [Member]
Cash and cash equivalents		8,093	250,386
Immucor Inc [Member] | Predecessor [Member] | Ending Balance [Member]
Cash and cash equivalents	17,827		314,304
Immucor Inc [Member] | Predecessor [Member]
Net cash provided by (used in) operating activities	(11,908)		64,243
Net cash used in investing activities	(1,940,133)		(393)
Net cash provided by ( used in) financing activities	1,655,564		68
Increase (decrease) in cash and cash equivalents	(296,477)		63,918
Immucor Inc [Member]
Cash and cash equivalents		1,871		8,093
Guarantor [Member] | Successor [Member] | Beginning Balance [Member]
Cash and cash equivalents	(89)
Guarantor [Member] | Successor [Member]
Net cash provided by (used in) operating activities		880
Net cash used in investing activities		(736)
Increase (decrease) in cash and cash equivalents		144
Guarantor [Member] | Predecessor [Member] | Beginning Balance [Member]
Cash and cash equivalents		(144)	(80)
Guarantor [Member] | Predecessor [Member] | Ending Balance [Member]
Cash and cash equivalents	(111)		(89)
Guarantor [Member] | Predecessor [Member]
Net cash provided by (used in) operating activities	(7)		144
Net cash used in investing activities	(15)		(153)
Increase (decrease) in cash and cash equivalents	(22)		(9)
Non-Guarantors [Member] | Successor [Member] | Beginning Balance [Member]
Cash and cash equivalents	8,748
Non-Guarantors [Member] | Successor [Member] | Ending Balance [Member]
Cash and cash equivalents		16,379
Non-Guarantors [Member] | Successor [Member]
Net cash provided by (used in) operating activities		5,501
Net cash used in investing activities		23
Effect of exchange rate changes on cash and cash equivalents		226
Increase (decrease) in cash and cash equivalents		5,750
Non-Guarantors [Member] | Predecessor [Member] | Beginning Balance [Member]
Cash and cash equivalents		10,629	52,297
Non-Guarantors [Member] | Predecessor [Member] | Ending Balance [Member]
Cash and cash equivalents	7,418		8,748
Non-Guarantors [Member] | Predecessor [Member]
Net cash provided by (used in) operating activities	(1,198)		(13,821)
Net cash used in investing activities	(146)		(1,719)
Net cash provided by ( used in) financing activities			(25,085)
Effect of exchange rate changes on cash and cash equivalents	14		(2,924)
Increase (decrease) in cash and cash equivalents	(1,330)		(43,549)
Non-Guarantors [Member]
Cash and cash equivalents		16,379		10,629
Intersegment Elimination [Member] | Successor [Member] | Ending Balance [Member]
Cash and cash equivalents		(107)
Intersegment Elimination [Member] | Successor [Member]
Net cash provided by (used in) operating activities		77
Effect of exchange rate changes on cash and cash equivalents		(184)
Increase (decrease) in cash and cash equivalents		(107)
Intersegment Elimination [Member] | Predecessor [Member]
Net cash provided by (used in) operating activities			(24,978)
Net cash provided by ( used in) financing activities			25,083
Effect of exchange rate changes on cash and cash equivalents			(105)
Intersegment Elimination [Member]
Cash and cash equivalents		(107)		(144)
Total [Member] | Successor [Member] | Beginning Balance [Member]
Cash and cash equivalents	322,963
Total [Member] | Successor [Member] | Ending Balance [Member]
Cash and cash equivalents		18,143
Total [Member] | Successor [Member]
Net cash provided by (used in) operating activities		(10,244)
Net cash used in investing activities		(2,167)
Net cash provided by ( used in) financing activities		11,934
Effect of exchange rate changes on cash and cash equivalents		42
Increase (decrease) in cash and cash equivalents		(435)
Total [Member] | Predecessor [Member] | Beginning Balance [Member]
Cash and cash equivalents		18,578	302,603
Total [Member] | Predecessor [Member] | Ending Balance [Member]
Cash and cash equivalents	25,134		322,963
Total [Member] | Predecessor [Member]
Net cash provided by (used in) operating activities	(13,113)		25,588
Net cash used in investing activities	(1,940,294)		(2,265)
Net cash provided by ( used in) financing activities	1,655,564		66
Effect of exchange rate changes on cash and cash equivalents	14		(3,029)
Increase (decrease) in cash and cash equivalents	(297,829)		20,360
Total [Member]
Cash and cash equivalents		$ 18,143		$ 18,578