SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND RECENTLY ADOPTED ACCOUNTING STANDARDS UPDATES ("ASU") (Policies)	6 Months Ended
Mar. 31, 2019
Accounting Policies [Abstract]
New Accounting Pronouncements, Policy	Revenue Recognition - The Company adopted ASU 2014-09, Revenue from Contracts with Customers (Topic 606), subsequent related Updates (collectively, ASU 2014-09), and ASU 2016-04, Liabilities - Extinguishments of Liabilities (Subtopic 405-20): Recognition of Breakage of Certain Prepaid Stored-Value Products on October 1, 2018. ASU 2014-09 modifies the guidance used to recognize revenue from contracts with customers for transfers of goods or services and transfers of non-financial assets, unless those contracts are within the scope of other guidance. Upon adoption, the Company recorded a cumulative-effect adjustment of $1.5 million to retained earnings, net of tax, due to changes in timing of revenue recognition from breakage of unregistered, unused prepaid cards in the Company’s Meta Payment Systems (MPS) division. Refer to Note 12. Revenue from Contracts with Customers for additional information. Financial Instruments - The Company adopted ASU 2016-01, Financial Instruments - Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Liabilities and related Updates (collectively, ASU 2016-01) on October 1, 2018. ASU 2016-01 makes several revisions to Subtopic 825-10, including that ASU 2016-01: (1) requires equity investments to be measured at fair value with changes in fair value recognized in net income, (2) simplifies impairment assessment of equity investments without readily determinable fair value, (3) eliminates requirement to disclose methods and significant assumptions used to estimate fair value of financial instruments measured at amortized cost, (4) requires the use of an exit price notion when measuring fair value of financial instruments for disclosure purposes, and (5) requires separate presentation of financial assets and liabilities by measurement category and form of financial asset on the balance sheet and accompanying notes. Upon adoption, the Company recorded a cumulative-effect adjustment that reclassed $0.5 million, net of tax, from accumulated other comprehensive income to retained earnings, due to the Company’s cumulative change in fair value of equity securities with readily determinable fair value. Refer to Note 6. Securities for additional information.

Revenue Recognition - The Company adopted ASU 2014-09, Revenue from Contracts with Customers (Topic 606), subsequent related Updates (collectively, ASU 2014-09), and ASU 2016-04, Liabilities - Extinguishments of Liabilities (Subtopic 405-20): Recognition of Breakage of Certain Prepaid Stored-Value Products on October 1, 2018. ASU 2014-09 modifies the guidance used to recognize revenue from contracts with customers for transfers of goods or services and transfers of non-financial assets, unless those contracts are within the scope of other guidance. Upon adoption, the Company recorded a cumulative-effect adjustment of $1.5 million to retained earnings, net of tax, due to changes in timing of revenue recognition from breakage of unregistered, unused prepaid cards in the Company’s Meta Payment Systems (MPS) division. Refer to Note 12. Revenue from Contracts with Customers for additional information.

Financial Instruments - The Company adopted ASU 2016-01, Financial Instruments - Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Liabilities and related Updates (collectively, ASU 2016-01) on October 1, 2018. ASU 2016-01 makes several revisions to Subtopic 825-10, including that ASU 2016-01: (1) requires equity investments to be measured at fair value with changes in fair value recognized in net income, (2) simplifies impairment assessment of equity investments without readily determinable fair value, (3) eliminates requirement to disclose methods and significant assumptions used to estimate fair value of financial instruments measured at amortized cost, (4) requires the use of an exit price notion when measuring fair value of financial instruments for disclosure purposes, and (5) requires separate presentation of financial assets and liabilities by measurement category and form of financial asset on the balance sheet and accompanying notes. Upon adoption, the Company recorded a cumulative-effect adjustment that reclassed $0.5 million, net of tax, from accumulated other comprehensive income to retained earnings, due to the Company’s cumulative change in fair value of equity securities with readily determinable fair value. Refer to Note 6. Securities for additional information.