Name:	blud_Note16CondensedConsolidatingFinancialInformationOfGuarantorSubsidiariesDetailsCondensedConsolidatingCashFlowInformationLineItems
Namespace Prefix:	blud_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Cash

-URI http://asc.fasb.org/extlink&oid=6506951

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Cash Equivalents

-URI http://asc.fasb.org/extlink&oid=6507016

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 1

-Article 5

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.1)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section 45

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3044-108585

+ Details

Name:	us-gaap_CashAndCashEquivalentsAtCarryingValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of increase (decrease) in cash and cash equivalents. Cash and cash equivalents are the amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Includes effect from exchange rate changes.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 24

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3521-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 830

-SubTopic 230

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6450594&loc=d3e33268-110906

+ Details

Name:	us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of increase (decrease) from the effect of exchange rate changes on cash and cash equivalent balances held in foreign currencies.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 830

-SubTopic 230

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6450594&loc=d3e33268-110906

+ Details

Name:	us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 24

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3521-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 26

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3574-108585

+ Details

Name:	us-gaap_NetCashProvidedByUsedInFinancingActivities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 24

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3521-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 26

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3574-108585

+ Details

Name:	us-gaap_NetCashProvidedByUsedInInvestingActivities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 24

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3521-108585

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 25

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585

+ Details

Name:	us-gaap_NetCashProvidedByUsedInOperatingActivities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

Note 16 - Condensed Consolidating Financial Information Of Guarantor Subsidiaries (Details) - Condensed Consolidating Cash Flow Information (USD $) In Thousands, unless otherwise specified	6 Months Ended				6 Months Ended							6 Months Ended						6 Months Ended							6 Months Ended			6 Months Ended
	Nov. 30, 2013	Nov. 30, 2012	May 31, 2013	May 31, 2012	Nov. 30, 2013 Immucor Inc [Member]	Nov. 30, 2012 Immucor Inc [Member]	May 31, 2013 Immucor Inc [Member]	Jun. 02, 2013 Immucor Inc [Member] Beginning Balance [Member]	Jun. 02, 2012 Immucor Inc [Member] Beginning Balance [Member]	Nov. 30, 2013 Immucor Inc [Member] Ending Balance [Member]	Nov. 30, 2012 Immucor Inc [Member] Ending Balance [Member]	Nov. 30, 2013 Guarantor [Member]	Nov. 30, 2012 Guarantor [Member]	May 31, 2013 Guarantor [Member]	Jun. 02, 2013 Guarantor [Member] Beginning Balance [Member]	Jun. 02, 2012 Guarantor [Member] Beginning Balance [Member]	Nov. 30, 2013 Guarantor [Member] Ending Balance [Member]	Nov. 30, 2013 Non-Guarantors [Member]	Nov. 30, 2012 Non-Guarantors [Member]	May 31, 2013 Non-Guarantors [Member]	Jun. 02, 2013 Non-Guarantors [Member] Beginning Balance [Member]	Jun. 02, 2012 Non-Guarantors [Member] Beginning Balance [Member]	Nov. 30, 2013 Non-Guarantors [Member] Ending Balance [Member]	Nov. 30, 2012 Non-Guarantors [Member] Ending Balance [Member]	Nov. 30, 2013 Eliminations [Member]	Nov. 30, 2012 Eliminations [Member]	Nov. 30, 2012 Eliminations [Member] Ending Balance [Member]	Nov. 30, 2013 Total [Member]	Nov. 30, 2012 Total [Member]	May 31, 2013 Total [Member]	Jun. 02, 2013 Total [Member] Beginning Balance [Member]	Jun. 02, 2012 Total [Member] Beginning Balance [Member]	Nov. 30, 2013 Total [Member] Ending Balance [Member]	Nov. 30, 2012 Total [Member] Ending Balance [Member]
Note 16 - Condensed Consolidating Financial Information Of Guarantor Subsidiaries (Details) - Condensed Consolidating Cash Flow Information [Line Items]
Net cash provided by (used in) operating activities	$ 13,045	$ 8,550			$ 8,013	$ (142)						$ (2,735)	$ 1,748					$ 8,564	$ 6,852						$ (797)	$ 92		$ 13,045	$ 8,550
Net cash provided by ( used in) investing activities	(3,195)	(4,028)			4,084	(2,422)						(1,169)	(1,604)					(6,110)	(2)									(3,195)	(4,028)
Net cash provided by ( used in) financing activities	(3,678)	(4,383)			(3,647)	(4,383)						(31)						(785)							785			(3,678)	(4,383)
Effect of exchange rate changes on cash and cash equivalents	663	296			(34)													685	481						12	(185)		663	296
Increase (decrease) in cash and cash equivalents	6,835	435			8,416	(6,947)						(3,935)	144					2,354	7,331							(93)		6,835	435
Cash and cash equivalents	$ 36,223	$ 19,013	$ 29,388	$ 18,578	$ 15,387		$ 6,971	$ 6,971	$ 8,093	$ 15,387	$ 1,146	$ 172		$ 4,107	$ 4,107	$ (144)	$ 172	$ 20,664		$ 18,310	$ 18,310	$ 10,629	$ 20,664	$ 17,960			$ (93)	$ 36,223		$ 29,388	$ 29,388	$ 18,578	$ 36,223	$ 19,013