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Summary of Significant Accounting Policies - Reserve for Operating Losses (Details) - USD ($)
$ in Thousands
12 Months Ended
May. 31, 2015
May. 31, 2014
May. 31, 2013
May. 31, 2012
Allowance For Operating Losses        
Accounting Policies [Abstract]        
Settlement Liabilities, Reserves $ 1,286 $ 1,725    
Allowance For Uncollectible Customer's Liability - Merchant Card Processing Services        
Valuation and Qualifying Accounts Disclosure [Line Items]        
Valuation and allowance reserve 1,286 1,724 $ 2,318 $ 2,325
Valuation and allowance charges 4,928 8,658 9,484  
Reserve for Operating Losses-Check Guarantee Processing        
Valuation and Qualifying Accounts Disclosure [Line Items]        
Valuation and allowance reserve 2,684 2,998 3,144 $ 3,435
Valuation and allowance charges 9,578 11,916 $ 11,731  
Other Receivables, Net, Current | Reserve for Operating Losses-Check Guarantee Processing        
Valuation and Qualifying Accounts Disclosure [Line Items]        
Valuation and allowance reserve $ 2,700 $ 3,000