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

No definition available.

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- Definition

Amount of provisions related to a debt instrument relating to events of default and covenants.

+ References

No definition available.

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Period Type:	duration

- Definition

The net leverage ratio associated with a credit facility.

+ References

No definition available.

+ Details

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Data Type:	xbrli:pureItemType
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- Definition

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

+ References

No definition available.

+ Details

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Balance Type:	debit
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- 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

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- Definition

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

+ References

No definition available.

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Data Type:	num:percentItemType
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- 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=64930739&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=64930785&loc=d3e28551-108399

+ Details

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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

+ Details

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- Definition

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

+ References

+ Details

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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

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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- 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 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-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 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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-Name Accounting Standards Codification
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-Section S99
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

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

+ References

+ Details

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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

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The cash inflow from amounts received from issuance of long-term debt that is wholly or partially secured by collateral. Excludes proceeds from tax exempt secured debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Financing Activities
-URI http://asc.fasb.org/extlink&oid=6513228

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- 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

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

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Note 13 - Long-term Debt (Details Textual) - USD ($)			12 Months Ended
Note 13 - Long-term Debt (Details Textual) - USD ($)	May 06, 2016	Aug. 19, 2011	May 31, 2016	May 31, 2013	Aug. 19, 2019	Feb. 19, 2019	Aug. 19, 2018	May 04, 2016	May 03, 2016	May 31, 2015
Term Loan Facility [Member] \| LIFECODES [Member]
Proceeds from Issuance of Secured Debt				$ 50,000,000
Term Loan Facility [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate			3.75%
Term Loan Facility [Member] \| Base Rate [Member]
Debt Instrument, Basis Spread on Variable Rate			2.75%
Term Loan Facility [Member]
Debt Instrument, Interest Rate, Stated Percentage			5.00%							5.00%
Debt Instrument Pricipal Payment Percent			0.25%
Long-term Debt, Current Maturities			$ 1,700,000
Debt Instrument, Interest Rate, Effective Percentage			6.10%
Original Term Loan Facility [Member]
Secured Long-term Debt, Noncurrent		$ 615,000,000
Revolving Credit Facility [Member] \| Minimum [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate			0.00%
Revolving Credit Facility [Member] \| Maximum [Member]
Line Of Credit Facility Net Leverage Ratio			5.25
Revolving Credit Facility [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate			3.75%
Revolving Credit Facility [Member] \| Base Rate [Member]
Debt Instrument, Basis Spread on Variable Rate			2.75%
Revolving Credit Facility [Member] \| Scenario, Forecast [Member]
Line of Credit Facility, Maximum Borrowing Capacity					$ 50,000,000	$ 60,000,000	$ 70,000,000
Revolving Credit Facility [Member]
Long-term Line of Credit			$ 0
Line of Credit Facility, Maximum Borrowing Capacity		100,000,000						$ 80,000,000	$ 100,000,000
Line of Credit Facility Step Down Rate			0.25%
Line Of Credit Facility Net Leverage Ratio			3
Letter of Credit [Member]
Line of Credit Facility, Maximum Borrowing Capacity		$ 25,000,000
Senior Credit Facilities [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate			1.00%
Senior Credit Facilities [Member] \| Federal Funds Effective Rate [Member]
Debt Instrument, Basis Spread on Variable Rate			0.50%
Minimum [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate	0.00%
Minimum [Member]
Line of Credit Facility, Interest Rate at Period End			1.25%
Notes Payable, Other Payables [Member]
Debt Instrument, Interest Rate, Stated Percentage		11.125%
Debt Instrument, Interest Rate, Effective Percentage			11.70%
Debt Instrument, Face Amount		$ 400,000,000
DebtInstrument Provisions		$ 25,000,000
Letters of Credit Outstanding, Amount			$ 0
Long-term Debt, Current Maturities			6,806,000							$ 6,640,000
Line Of Credit Facility Provisions			$ 20,000,000