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Processing System Intrusion (Details) - USD ($) $ in Thousands	12 Months Ended
	May. 31, 2015	May. 31, 2014	May. 31, 2013
Unusual Items [Abstract]
Cumulated expenses		$ 114,200
Insurance recoveries		27,000
Processing system intrusion	$ 0	$ (7,000)	$ 36,775

X

- Definition

Processing System Intrusion Expense

+ References

No definition available.

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- Definition

Unusual Items [Abstract]

+ References

No definition available.

+ Details

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- Definition

The gross income statement effect of insurance proceeds for each material event or transaction (that would not reasonably be expected to recur in the foreseeable future) that possesses a high degree of abnormality and are clearly unrelated to, or incidentally related to, the ordinary and typical activities of the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 20
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6365513&loc=d3e15138-107781

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- Definition

Difference of unusual or infrequent items gross less applicable insurance proceeds.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 20
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6365513&loc=d3e15138-107781

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 55
-Paragraph 66
-URI http://asc.fasb.org/extlink&oid=51663037&loc=d3e34211-109320

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 605
-SubTopic 40
-Section 25
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=51664486&loc=d3e59193-111647

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 605
-SubTopic 40
-Section 25
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=51664486&loc=d3e59170-111647

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 10
-Section 60
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=51677771&loc=d3e11642-108343

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