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Summary of Significant Accounting Policies - Revenue Recognition (Details)	12 Months Ended
	May. 31, 2015 segment
Accounting Policies [Abstract]
Number of merchant services segments	3

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- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration