GOODWILL AND INTANGIBLE ASSETS (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2018	Aug. 01, 2018	Sep. 30, 2017	Dec. 14, 2016	Nov. 01, 2016	Sep. 08, 2015	Dec. 02, 2014
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 98,723	$ 36,928	$ 36,928	$ 303,270		$ 98,723
Goodwill [Roll Forward]
Balance, beginning of period	98,723	36,928
Acquisitions during the period	204,547	61,795
Write-offs during the period	0	0
Balance, end of period	303,270	98,723	36,928
Intangible Assets [Roll Forward]
Balance, beginning of period	52,178	28,921
Acquisitions during the period	28,361	46,397
Amortization during the period	(9,641)	(12,363)
Write-offs during the period	(179)	(10,777)
Balance upon acquisition				110,143		81,782
Accumulated amortization				(28,468)		(18,827)
Accumulated impairment				(10,956)		(10,777)
Balance, end of period	70,719	52,178	28,921
Intangible impairment	$ 18	10,248	0
Book Amortization Period	9 years 11 months 1 day
Anticipated intangible amortization [Abstract]
2019				17,733
2020				11,017
2021				8,559
2022				6,404
2023				5,077
Thereafter				21,929
Total anticipated intangible amortization	$ 52,178	28,921	28,921	70,719		52,178
AFS/IBEX Financial Services Inc [Member]
Finite-Lived Intangible Assets [Line Items]
Goodwill										$ 11,600
Refund Advantage [Member]
Finite-Lived Intangible Assets [Line Items]
Goodwill									$ 25,400
EPS Financial, LLC [Member]
Finite-Lived Intangible Assets [Line Items]
Goodwill								$ 30,375
Specialty Consumer Services [Member]
Finite-Lived Intangible Assets [Line Items]
Goodwill							$ 31,419
Crestmark Bancorp, Inc. [Member]
Finite-Lived Intangible Assets [Line Items]
Goodwill					$ 204,547
Trademark [Member]
Intangible Assets [Roll Forward]
Balance, beginning of period	10,051	5,149
Acquisitions during the period	3,634	5,500
Amortization during the period	(698)	(598)
Write-offs during the period	0	0
Balance upon acquisition				14,624		10,990
Accumulated amortization				(1,637)		(939)
Accumulated impairment						0
Balance, end of period	$ 12,987	10,051	5,149
Book Amortization Period	10 years
Anticipated intangible amortization [Abstract]
Total anticipated intangible amortization	$ 10,051	5,149	5,149	12,987		10,051
Trademark [Member] | Refund Advantage [Member]
Intangible Assets [Roll Forward]
Book Amortization Period	15 years
Non-Compete [Member]
Intangible Assets [Roll Forward]
Balance, beginning of period	$ 1,782	127
Acquisitions during the period	0	2,180
Amortization during the period	(485)	(525)
Write-offs during the period	0	0
Balance upon acquisition				2,480		2,480
Accumulated amortization				(1,183)		(698)
Accumulated impairment						0
Balance, end of period	1,297	1,782	127
Anticipated intangible amortization [Abstract]
Total anticipated intangible amortization	$ 1,782	127	127	1,297		1,782
Non-Compete [Member] | Refund Advantage [Member]
Intangible Assets [Roll Forward]
Book Amortization Period	3 years
Customer Relationships [Member]
Intangible Assets [Roll Forward]
Balance, beginning of period	$ 31,707	20,590
Acquisitions during the period	24,278	31,770
Amortization during the period	(7,530)	(10,405)
Write-offs during the period	0	(10,248)
Balance upon acquisition				82,088		57,810
Accumulated amortization				(23,385)		(15,855)
Accumulated impairment				(10,248)		(10,248)
Balance, end of period	$ 48,455	31,707	20,590
Book Amortization Period	10 years
Anticipated intangible amortization [Abstract]
Total anticipated intangible amortization	$ 31,707	20,590	20,590	48,455		31,707
Customer Relationships [Member] | Refund Advantage [Member] | Minimum [Member]
Intangible Assets [Roll Forward]
Book Amortization Period	10 years
Customer Relationships [Member] | Refund Advantage [Member] | Maximum [Member]
Intangible Assets [Roll Forward]
Book Amortization Period	30 years
Technology/Other [Member]
Intangible Assets [Roll Forward]
Balance, beginning of period	$ 8,638	3,055
Acquisitions during the period	449	6,947
Amortization during the period	(928)	(835)
Write-offs during the period	(179)	(529)
Balance upon acquisition				10,951		10,502
Accumulated amortization				(2,263)		(1,335)
Accumulated impairment				(708)		(529)
Balance, end of period	$ 7,980	8,638	3,055
Book Amortization Period	3 years
Anticipated intangible amortization [Abstract]
Total anticipated intangible amortization	$ 8,638	$ 3,055	$ 3,055	$ 7,980		$ 8,638
Technology/Other [Member] | Refund Advantage [Member] | Minimum [Member]
Intangible Assets [Roll Forward]
Book Amortization Period	3 years
Technology/Other [Member] | Refund Advantage [Member] | Maximum [Member]
Intangible Assets [Roll Forward]
Book Amortization Period	20 years