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Schedule II Valuation and Qualifying Accounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
May. 31, 2015
May. 31, 2014
May. 31, 2013
Allowance for doubtful accounts [Member]      
Movement in Valuation Allowances and Reserves [Roll Forward]      
(b) Balance at Beginning of Year $ 401 $ 509 $ 532
(c) Additions: Charged to Costs and Expenses 324 174 444
(d) Deductions: Uncollectible Accounts Write-Off 257 282 467
(e) Balance at End of Year 468 401 509
Allowance For Uncollectible Customer's Liability - Merchant Card Processing Services      
Movement in Valuation Allowances and Reserves [Roll Forward]      
(b) Balance at Beginning of Year 1,724 2,318 2,325
(c) Additions: Charged to Costs and Expenses 4,928 8,658 9,484
(d) Deductions: Uncollectible Accounts Write-Off 5,366 9,252 9,491
(e) Balance at End of Year 1,286 1,724 2,318
Reserve for sales allowances-Merchant card processing      
Movement in Valuation Allowances and Reserves [Roll Forward]      
(b) Balance at Beginning of Year 601 961 873
(c) Additions: Charged to Costs and Expenses 7,974 1,330 2,074
(d) Deductions: Uncollectible Accounts Write-Off 3,646 1,690 1,986
(e) Balance at End of Year 4,929 601 961
Reserve for Operating Losses-Check Guarantee Processing      
Movement in Valuation Allowances and Reserves [Roll Forward]      
(b) Balance at Beginning of Year 2,998 3,144 3,435
(c) Additions: Charged to Costs and Expenses 9,578 11,916 11,731
(d) Deductions: Uncollectible Accounts Write-Off 9,892 12,062 12,022
(e) Balance at End of Year 2,684 2,998 3,144
Deferred tax asset valuation allowance [Member]      
Movement in Valuation Allowances and Reserves [Roll Forward]      
(b) Balance at Beginning of Year 7,199 28,464 26,090
(c) Additions: Charged to Costs and Expenses (3,376) (21,265) 2,374
(d) Deductions: Uncollectible Accounts Write-Off 0 0 0
(e) Balance at End of Year $ 3,823 $ 7,199 $ 28,464