Summary of Significant Accounting Policies - Additional Information (Details) $ in Thousands		12 Months Ended
	Jun. 30, 2017 segment	Mar. 31, 2019 USD ($) segment shares	Mar. 31, 2018 USD ($) shares	Mar. 31, 2017 USD ($) segment shares
Accounting Policies [Line Items]
Number of operating segments | segment	1	1
Number of reportable segments | segment				2
Maturity of time deposits		90 days
Cash, uninsured amount		$ 32,746
Cash, FDIC insured amount		250
Cash and cash equivalents		33,079	$ 28,845
Depreciation		10,298	10,498	$ 10,080
Advertising costs		8,226	$ 9,073	$ 7,111
Right-of-use assets		39,000
Lease liabilities		51,000
Reduction to other current and noncurrent liabilities		$ 12,000
Employee Stock Options
Accounting Policies [Line Items]
Options excluded from the computation of diluted net income per share | shares		1,963	2,984	2,999
Minimum
Accounting Policies [Line Items]
Amortization period of intangible assets		3 years
Maximum
Accounting Policies [Line Items]
Amortization period of intangible assets		10 years
Computer Equipment | Minimum
Accounting Policies [Line Items]
Useful life		3 years
Computer Equipment | Maximum
Accounting Policies [Line Items]
Useful life		5 years
Furniture and Fixtures
Accounting Policies [Line Items]
Furniture's and fixtures useful life lesser of lease term		lesser of lease term or estimated useful life of asset
Furniture and Fixtures | Minimum
Accounting Policies [Line Items]
Useful life		3 years
Furniture and Fixtures | Maximum
Accounting Policies [Line Items]
Useful life		7 years
Capitalized Software Costs
Accounting Policies [Line Items]
Useful life		3 years