Business Combinations - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands			3 Months Ended		6 Months Ended
	Jan. 25, 2019	Oct. 09, 2018	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Mar. 31, 2019
Business Acquisition [Line Items]
Stock-based compensation expense			$ 23,358	$ 13,833	$ 44,546	$ 24,860
Preliminary purchase price allocation, goodwill			$ 41,512		$ 41,512		$ 41,512
SignifAI, Inc.
Business Acquisition [Line Items]
Consideration paid	$ 36,251
Cash consideration paid	$ 25,119
Number of shares issued to acquire capital stock (in shares)	143,861
Aggregate fair value of common stock	$ 11,900
Fair value of shares issued to acquire capital stock (in usd per share)	$ 82.69
Stock-based compensation expense	$ 800
Holdback arrangement, common stock (in shares)	152,840
Amount excluded from the aggregate purchase price	$ 12,600
Preliminary purchase price allocation, goodwill	$ 26,178
SignifAI, Inc. | Minimum
Business Acquisition [Line Items]
Vesting period	24 months
SignifAI, Inc. | Maximum
Business Acquisition [Line Items]
Vesting period	36 months
CoScale NV
Business Acquisition [Line Items]
Cash consideration paid		$ 6,300
Amount excluded from the aggregate purchase price		900
Preliminary purchase price allocation, goodwill		3,400
CoScale NV | Technology
Business Acquisition [Line Items]
Acquired technology		$ 2,900
Acquired technology, estimated useful life		3 years