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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 |  |

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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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- Definition Amount of increase in the allowances and reserves, which consist of the valuation and qualifying accounts that are either netted against the cost of an asset or that reflect a liability established to represent expected future costs, from charges to costs and expenses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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