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Long-Term Liabilities - Additional Information (Detail) (Life Insurance Loans [Member], USD $)	9 Months Ended
	Feb. 28, 2015	May 31, 2014
Schedule Of Long Term Debt [Line Items]
Weighted Average Interest Rate	5.90%us-gaap_DebtWeightedAverageInterestRate
Prepaid Interest	217,000us-gaap_PrepaidInterest	$ 165,000us-gaap_PrepaidInterest
Minimum [Member]
Schedule Of Long Term Debt [Line Items]
Interest Rate	4.20%us-gaap_DebtInstrumentInterestRateDuringPeriod / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = us-gaap_LifeInsuranceSegmentMember
Maximum [Member]
Schedule Of Long Term Debt [Line Items]
Interest Rate	7.40%us-gaap_DebtInstrumentInterestRateDuringPeriod / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = us-gaap_LifeInsuranceSegmentMember

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X

- Definition

The average effective interest rate during the reporting period.

+ References

Reference 1: 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



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5



Reference 3: 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

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- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

+ Details

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- Definition

Amount of asset related to consideration paid in advance for interest that provides economic benefits within a future period of one year or the normal operating cycle, if longer.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Current Assets

-URI http://asc.fasb.org/extlink&oid=6509628



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6787-107765



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 340

-SubTopic 10

-Section 05

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=47804770&loc=d3e5865-108316



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 340

-SubTopic 10

-Section 05

-Paragraph 5

-URI http://asc.fasb.org/extlink&oid=47804770&loc=d3e5879-108316



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section 45

-Paragraph 1

-Subparagraph (g)(2)

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

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Period Type:	instant