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BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Reserve for operating losses (Details) - USD ($)
$ in Thousands
3 Months Ended 7 Months Ended 12 Months Ended
Aug. 31, 2016
Dec. 31, 2016
May 31, 2016
May 31, 2015
May 31, 2014
May 31, 2013
Allowance For Uncollectible Customer's Liability - Merchant Card Processing Services            
Valuation and Qualifying Accounts Disclosure [Line Items]            
Reserves for processing obligations   $ (2,300) $ (2,500) $ (1,300)    
Valuation and allowance charges   4,629 3,729 4,928 $ 8,658  
Valuation and allowance reserve   2,279 2,460 1,286 1,724 $ 2,318
Reserve for Operating Losses-Check Guarantee Processing            
Valuation and Qualifying Accounts Disclosure [Line Items]            
Valuation and allowance charges $ 22,800 15,204 22,827 9,578 11,916  
Valuation and allowance reserve   5,786 4,868 2,684 $ 2,998 $ 3,144
Other Receivables, Net, Current | Reserve for Operating Losses-Check Guarantee Processing            
Valuation and Qualifying Accounts Disclosure [Line Items]            
Valuation and allowance reserve   $ 5,800 $ 4,900 $ 2,700