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BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Reserve for Operating Losses (Details) - USD ($) $ in Thousands	7 Months Ended	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2017	May 31, 2016	May 31, 2015	May 31, 2014
Allowance For Uncollectible Customer's Liability - Merchant Card Processing Services
Valuation and Qualifying Accounts Disclosure [Line Items]
Valuation and allowance charges	$ 4,629	$ 14,893	$ 3,729	$ 4,928
Valuation and allowance reserve	2,279	3,460	2,460	1,286	$ 1,724
Reserve for Operating Losses-Check Guarantee Processing
Valuation and Qualifying Accounts Disclosure [Line Items]
Valuation and allowance charges	15,204	28,064	22,827	9,578
Valuation and allowance reserve	$ 5,786	$ 5,738	$ 4,868	$ 2,684	$ 2,998

X

- 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

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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

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- Definition

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+ References

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