Business Combination - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands				12 Months Ended
	Jan. 25, 2019	Oct. 30, 2018	Oct. 09, 2018	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Business Acquisition [Line Items]
Stock-based compensation expense				$ 56,198	$ 40,598	$ 31,946
Preliminary purchase price allocation, goodwill				$ 41,512	$ 11,828
SignifAI, Inc.
Business Acquisition [Line Items]
Business acquisition, aggregate purchase price	$ 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
Total direct transactions costs	$ 900
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
CoScale NV
Business Acquisition [Line Items]
Cash consideration paid			$ 6,300
Total direct transactions costs		$ 300
Amount excluded from the aggregate purchase price			900
Preliminary purchase price allocation, goodwill			3,400
Technology | CoScale NV
Business Acquisition [Line Items]
Acquired technology			$ 2,900
Acquired technology, estimated useful life			3 years
Minimum | SignifAI, Inc.
Business Acquisition [Line Items]
Vesting period	24 months
Maximum | SignifAI, Inc.
Business Acquisition [Line Items]
Vesting period	36 months