Principal payments required under a debt instrument expressed as a percentage of the original principal amount.

No definition available.

Name:	blud_DebtInstrumentPricipalPaymentPercent
Namespace Prefix:	blud_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The net leverage ratio associated with a credit facility.

+ References

No definition available.

+ Details

Name:	blud_LineOfCreditFacilityNetLeverageRatio
Namespace Prefix:	blud_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of provisions related to a line of credit facility relating to events of default and covenants.

+ References

No definition available.

+ Details

Name:	blud_LineOfCreditFacilityProvisions
Namespace Prefix:	blud_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The percentage by which the applicable margin for borrowings on the credit facility steps down if the company falls below a leverage ratio threshold.

+ References

No definition available.

+ Details

Name:	blud_LineOfCreditFacilityStepDownRate
Namespace Prefix:	blud_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- References

No definition available.

+ Details

Name:	blud_Note10LongtermDebtDetailsLineItems
Namespace Prefix:	blud_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 55

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

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

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

+ Details

Name:	us-gaap_DebtInstrumentInterestRateEffectivePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtWeightedAverageInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

Name:	us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.16)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.16)

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 20, 22

-Article 5

+ Details

Name:	us-gaap_LineOfCredit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The effective interest rate at the end of the reporting period.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Carrying amount of collateralized debt obligations with maturities initially due after one year or beyond the operating cycle, if longer, excluding the current portion. Obligations include, but not limited to, mortgage loans, chattel loans, and other borrowings secured by assets.

+ References

+ Details

Name:	us-gaap_SecuredLongTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_NotesPayableOtherPayablesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_BaseRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_LetterOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=blud_SeniorCreditFacilitiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=blud_FederalFundsEffectiveRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=blud_OriginalTermLoanFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=blud_TermLoanFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Note 10 - Long-term Debt (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Note 10 - Long-term Debt (Details) - USD ($) $ in Thousands	Aug. 31, 2015	May. 31, 2015	May. 31, 2014
Note 10 - Long-term Debt (Details) [Line Items]
Long-term Line of Credit (in Dollars)	$ 16,000
Letters of Credit Outstanding, Amount (in Dollars)	$ 0
Line of Credit Facility, Provisions (in Dollars)		$ 0	$ 0
Notes Payable, Other Payables [Member]
Note 10 - Long-term Debt (Details) [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	11.125%
Debt Instrument, Interest Rate, Effective Percentage	11.60%
Debt Instrument, Face Amount (in Dollars)	$ 400,000
Revolving Credit Facility [Member]
Note 10 - Long-term Debt (Details) [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity (in Dollars)	$ 100,000
Line of Credit Facility Step Down Rate	0.25%
Line of Credit Facility, Net Leverage Ratio	3
Long-term Line of Credit (in Dollars)	$ 16,000
Debt, Weighted Average Interest Rate	4.90%
Revolving Credit Facility [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Note 10 - Long-term Debt (Details) [Line Items]
Debt Instrument, Basis Spread on Variable Rate	3.75%
Revolving Credit Facility [Member] \| Base Rate [Member]
Note 10 - Long-term Debt (Details) [Line Items]
Debt Instrument, Basis Spread on Variable Rate	2.75%
Letter of Credit [Member]
Note 10 - Long-term Debt (Details) [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity (in Dollars)	$ 25,000
Senior Credit Facilities [Member] \| Federal Funds Effective Rate [Member]
Note 10 - Long-term Debt (Details) [Line Items]
Debt Instrument, Basis Spread on Variable Rate	0.50%
Senior Credit Facilities [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Note 10 - Long-term Debt (Details) [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.00%
Original Term Loan Facility [Member]
Note 10 - Long-term Debt (Details) [Line Items]
Secured Long-term Debt, Noncurrent (in Dollars)	$ 663,300
Term Loan Facility [Member]
Note 10 - Long-term Debt (Details) [Line Items]
Line of Credit Facility, Net Leverage Ratio	1,700,000
Debt Instrument, Interest Rate, Stated Percentage	5.00%	5.00%
Debt Instrument, Interest Rate, Effective Percentage	6.10%
Debt Instrument Pricipal Payment Percent	0.25%
Term Loan Facility [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Note 10 - Long-term Debt (Details) [Line Items]
Debt Instrument, Basis Spread on Variable Rate	3.75%
Term Loan Facility [Member] \| Base Rate [Member]
Note 10 - Long-term Debt (Details) [Line Items]
Debt Instrument, Basis Spread on Variable Rate	2.75%
Minimum [Member]
Note 10 - Long-term Debt (Details) [Line Items]
Line of Credit Facility, Interest Rate at Period End	1.25%