Business Combinations - Summary of Purchase Price Allocation (Details) - USD ($) $ in Thousands							12 Months Ended
	Dec. 17, 2019	Dec. 06, 2019	Oct. 04, 2019	Jan. 31, 2018	Aug. 16, 2017	Apr. 14, 2017	Mar. 31, 2020	Mar. 31, 2019
Business Acquisition [Line Items]
Fair value of contingent consideration							$ 1,850
Preliminary fair value of identifiable intangible assets acquired:
Goodwill							$ 267,165	$ 218,771
Topaz
Business Acquisition [Line Items]
Initial preliminary purchase price			$ 8,000
Settlement of pre-existing net liabilities			1,671
Fair value of contingent consideration			1,850
Preliminary working capital adjustment			(344)
Total preliminary purchase price			11,177
Preliminary fair value of the net tangible assets acquired and liabilities assumed:
Acquired cash and cash equivalents			353
Accounts receivable			1,528
Prepaid expense and other assets			139
Equipment and improvements			194
Operating lease assets			534
Accounts payable			(224)
Accrued compensation and related benefits			(155)
Contract liabilities			(370)
Operating lease liabilities			(240)
Operating lease liabilities, net of current			(360)
Other liabilities			(102)
Total preliminary net tangible assets acquired and liabilities assumed			1,297
Preliminary fair value of identifiable intangible assets acquired:
Goodwill			5,380
Total preliminary identifiable intangible assets acquired			9,880
Total preliminary purchase price			11,177
Medfusion
Business Acquisition [Line Items]
Initial preliminary purchase price		$ 43,000
Settlement of pre-existing net liabilities		24
Preliminary working capital adjustment		(247)
Total preliminary purchase price		42,777
Preliminary fair value of the net tangible assets acquired and liabilities assumed:
Acquired cash and cash equivalents		204
Accounts receivable		986
Prepaid expense and other assets		387
Equipment and improvements		434
Accounts payable		(1,360)
Accrued compensation and related benefits		(270)
Contract liabilities		(529)
Deferred income tax liability		(953)
Other liabilities		(496)
Total preliminary net tangible assets acquired and liabilities assumed		(1,597)
Preliminary fair value of identifiable intangible assets acquired:
Goodwill		23,524
Total preliminary identifiable intangible assets acquired		44,374
Total preliminary purchase price		42,777
OTTO
Business Acquisition [Line Items]
Initial preliminary purchase price	$ 22,000
Settlement of pre-existing net liabilities	19
Preliminary working capital adjustment	(59)
Total preliminary purchase price	21,960
Preliminary fair value of the net tangible assets acquired and liabilities assumed:
Acquired cash and cash equivalents	102
Accounts receivable	51
Prepaid expense and other assets	79
Accounts payable	(2)
Accrued compensation and related benefits	(123)
Contract liabilities	(11)
Other liabilities	(26)
Total preliminary net tangible assets acquired and liabilities assumed	70
Preliminary fair value of identifiable intangible assets acquired:
Goodwill	19,490
Total preliminary identifiable intangible assets acquired	21,890
Total preliminary purchase price	21,960
Inforth Technologies, LLC
Business Acquisition [Line Items]
Initial preliminary purchase price				$ 4,000
Settlement of pre-existing net liabilities				337
Total preliminary purchase price				4,337
Preliminary fair value of the net tangible assets acquired and liabilities assumed:
Acquired cash and cash equivalents				25
Accounts receivable				6
Accrued compensation and related benefits				(49)
Other liabilities				(22)
Total preliminary net tangible assets acquired and liabilities assumed				(40)
Preliminary fair value of identifiable intangible assets acquired:
Goodwill				1,177
Total preliminary identifiable intangible assets acquired				4,377
Total preliminary purchase price				4,337
EagleDream Health
Business Acquisition [Line Items]
Initial preliminary purchase price					$ 26,000
Preliminary working capital adjustment					(391)
Total preliminary purchase price					25,609
Preliminary fair value of the net tangible assets acquired and liabilities assumed:
Acquired cash and cash equivalents					573
Accounts receivable					217
Prepaid expense and other assets					20
Accounts payable					(115)
Accrued compensation and related benefits					(691)
Contract liabilities					(394)
Deferred income tax liability					(1,707)
Other liabilities					(122)
Total preliminary net tangible assets acquired and liabilities assumed					(2,219)
Preliminary fair value of identifiable intangible assets acquired:
Goodwill					14,428
Total preliminary identifiable intangible assets acquired					27,828
Total preliminary purchase price					25,609
Entrada
Business Acquisition [Line Items]
Initial preliminary purchase price						$ 34,000
Preliminary working capital adjustment						(42)
Total preliminary purchase price						33,958
Preliminary fair value of the net tangible assets acquired and liabilities assumed:
Acquired cash and cash equivalents						102
Accounts receivable						1,836
Prepaid expense and other assets						145
Equipment and improvements						163
Capitalized software costs						364
Deferred income tax asset						117
Accounts payable						(639)
Accrued compensation and related benefits						(120)
Contract liabilities						(234)
Other liabilities						(444)
Total preliminary net tangible assets acquired and liabilities assumed						1,290
Preliminary fair value of identifiable intangible assets acquired:
Goodwill						17,268
Total preliminary identifiable intangible assets acquired						32,668
Total preliminary purchase price						33,958
Computer Software, Intangible Asset | Topaz
Preliminary fair value of identifiable intangible assets acquired:
Total preliminary identifiable intangible assets acquired			$ 4,500
Computer Software, Intangible Asset | Medfusion
Preliminary fair value of identifiable intangible assets acquired:
Total preliminary identifiable intangible assets acquired		13,800
Computer Software, Intangible Asset | OTTO
Preliminary fair value of identifiable intangible assets acquired:
Total preliminary identifiable intangible assets acquired	$ 2,400
Computer Software, Intangible Asset | Inforth Technologies, LLC
Preliminary fair value of identifiable intangible assets acquired:
Total preliminary identifiable intangible assets acquired				$ 3,200
Computer Software, Intangible Asset | EagleDream Health
Preliminary fair value of identifiable intangible assets acquired:
Total preliminary identifiable intangible assets acquired					12,800
Computer Software, Intangible Asset | Entrada
Preliminary fair value of identifiable intangible assets acquired:
Total preliminary identifiable intangible assets acquired						10,500
Customer Relationships | Medfusion
Preliminary fair value of identifiable intangible assets acquired:
Total preliminary identifiable intangible assets acquired		6,800
Customer Relationships | EagleDream Health
Preliminary fair value of identifiable intangible assets acquired:
Total preliminary identifiable intangible assets acquired					$ 600
Customer Relationships | Entrada
Preliminary fair value of identifiable intangible assets acquired:
Total preliminary identifiable intangible assets acquired						3,300
Trade Names | Medfusion
Preliminary fair value of identifiable intangible assets acquired:
Total preliminary identifiable intangible assets acquired		$ 250
Trade Names | Entrada
Preliminary fair value of identifiable intangible assets acquired:
Total preliminary identifiable intangible assets acquired						$ 1,600