Acquisitions (Details) - USD ($) $ in Thousands		12 Months Ended
	May 31, 2019	Sep. 30, 2019	Mar. 31, 2020	Mar. 31, 2019
Business Acquisition [Line Items]
Cash and cash equivalents		$ 4,561
Accounts receivable		5,452
Settlement assets		18
Related party receivable		0
Inventories		106
Prepaid expenses and other current assets		542
Property and equipment		2,456
Goodwill		168,284	$ 167,054	$ 104,651
Other assets		2,624
Total assets acquired		161,798
Accounts payable		1,091
Accrued expenses and other current liabilities		2,340
Settlement obligations		18
Deferred revenue, current		2,722
Other long-term liabilities		687
Net assets acquired		154,940
Capitalized software
Business Acquisition [Line Items]
Intangible assets		12,840
Acquired merchant relationships
Business Acquisition [Line Items]
Intangible assets		47,880
Exclusivity agreements
Business Acquisition [Line Items]
Intangible assets		0
Non-compete agreements
Business Acquisition [Line Items]
Intangible assets		210
Trade name
Business Acquisition [Line Items]
Intangible assets		2,040
Pace Payment Systems, Inc.
Business Acquisition [Line Items]
Consideration transferred	$ 56,053
Proceeds from issuance of long-term debt used to fund the acquisition	52,492
Contingent cash consideration	$ 3,336
Estimated amortization period	15 years
Acquisition-related costs	$ 507
Potential additional consideration	20,000
Cash and cash equivalents		108
Accounts receivable		545
Settlement assets		0
Related party receivable		0
Inventories		45
Prepaid expenses and other current assets		59
Property and equipment		527
Goodwill		35,589
Other assets		2,622
Total assets acquired		56,855
Accounts payable		722
Accrued expenses and other current liabilities		56
Settlement obligations		0
Deferred revenue, current		24
Other long-term liabilities		0
Net assets acquired		56,053
Pace Payment Systems, Inc. | Class A Common Stock
Business Acquisition [Line Items]
Consideration transferred	$ 225
Pace Payment Systems, Inc. | Capitalized software
Business Acquisition [Line Items]
Estimated amortization period	7 years
Intangible assets		3,400
Pace Payment Systems, Inc. | Acquired merchant relationships
Business Acquisition [Line Items]
Estimated amortization period	15 years
Intangible assets		13,400
Pace Payment Systems, Inc. | Exclusivity agreements
Business Acquisition [Line Items]
Intangible assets		0
Pace Payment Systems, Inc. | Non-compete agreements
Business Acquisition [Line Items]
Estimated amortization period	3 years
Intangible assets		60
Pace Payment Systems, Inc. | Trade name
Business Acquisition [Line Items]
Estimated amortization period	5 years
Intangible assets		500
Other 2019 Business Combinations
Business Acquisition [Line Items]
Proceeds from issuance of long-term debt used to fund the acquisition		89,191
Contingent cash consideration		$ 9,696
Estimated amortization period		16 years
Acquisition-related costs		$ 1,299
Potential additional consideration		34,900
Total purchase consideration		98,887
Cash and cash equivalents		4,453
Accounts receivable		4,907
Settlement assets		18
Related party receivable		0
Inventories		61
Prepaid expenses and other current assets		483
Property and equipment		1,929
Goodwill		47,480
Other assets		2
Total assets acquired		104,943
Accounts payable		369
Accrued expenses and other current liabilities		2,284
Settlement obligations		18
Deferred revenue, current		2,698
Other long-term liabilities		687
Net assets acquired		$ 98,887
Other 2019 Business Combinations | Capitalized software
Business Acquisition [Line Items]
Estimated amortization period		6 years
Intangible assets		$ 9,440
Other 2019 Business Combinations | Acquired merchant relationships
Business Acquisition [Line Items]
Intangible assets		34,480
Other 2019 Business Combinations | Exclusivity agreements
Business Acquisition [Line Items]
Intangible assets		$ 0
Other 2019 Business Combinations | Non-compete agreements
Business Acquisition [Line Items]
Estimated amortization period		3 years
Intangible assets		$ 150
Other 2019 Business Combinations | Trade name
Business Acquisition [Line Items]
Estimated amortization period		5 years
Intangible assets		$ 1,540
Other 2019 Business Combinations | Minimum | Acquired merchant relationships
Business Acquisition [Line Items]
Estimated amortization period		13 years
Other 2019 Business Combinations | Maximum | Acquired merchant relationships
Business Acquisition [Line Items]
Estimated amortization period		20 years
A2019 Business Combinations
Business Acquisition [Line Items]
Goodwill		$ 83,069