Summary of Significant Accounting Policies - Cash and Cash Equivalents (Details) (USD $) In Thousands, unless otherwise specified	Aug. 31, 2014	May 31, 2014
Cash and Cash Equivalents [Line Items]
Settlement processing assets	$ 1,141,608	$ 780,917
Cash and Cash Equivalents [Member]
Cash and Cash Equivalents [Line Items]
Settlement processing assets	$ 180,100	$ 124,700

Cash received or short term receivables for unsettled money transfers, money orders, consumer payments, or business to business payments. Settlement assets include clearing and settling customers payments due to and from financial institutions and may include cash and cash equivalents.

No definition available.

Name:	us-gaap_SettlementAssetsCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant