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Acquisitions PayCommerce Financial Solutions Acquisition (Details) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Jun. 30, 2019
Sep. 30, 2018
PayCommerce [Member] [Member]    
Business Acquisition [Line Items]    
Business Combination, Consideration Transferred   $ 3.8
Business Combination, Acquired Receivable, Fair Value   0.7
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment   0.8
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Financial Assets   0.5
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities   2.2
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles   $ 1.3
Finite-Lived Intangible Asset, Useful Life   5 years
Goodwill, Acquired During Period   $ 2.6
Akshay Financeware, Inc. Acquisition [Member]    
Business Acquisition [Line Items]    
Business Combination, Consideration Transferred $ 0.2