Fair Value Measurements - Summary of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands		Mar. 31, 2021	Mar. 31, 2020
Assets:
Total assets measured at fair value		$ 355
Liabilities:
Total liabilities measured at fair value			$ 227
Recurring [Member]
Assets:
Total assets measured at fair value		31,106	129,307
Liabilities:
Total liabilities measured at fair value			227
Recurring [Member] | Pension plan assets [Member]
Assets:
Total assets measured at fair value	[1]	15,751	12,436
Recurring [Member] | Short-term Investments [Member]
Assets:
Total assets measured at fair value	[2]	15,000	116,871
Recurring [Member] | Foreign currency forward contracts [Member]
Assets:
Total assets measured at fair value	[3]	355
Liabilities:
Total liabilities measured at fair value	[3]		227
Recurring [Member] | Level 1 [Member]
Assets:
Total assets measured at fair value			116,871
Recurring [Member] | Level 1 [Member] | Short-term Investments [Member]
Assets:
Total assets measured at fair value	[2]		116,871
Recurring [Member] | Level 2 [Member]
Assets:
Total assets measured at fair value		31,106	12,436
Liabilities:
Total liabilities measured at fair value			227
Recurring [Member] | Level 2 [Member] | Pension plan assets [Member]
Assets:
Total assets measured at fair value	[1]	15,751	12,436
Recurring [Member] | Level 2 [Member] | Short-term Investments [Member]
Assets:
Total assets measured at fair value	[2]	15,000
Recurring [Member] | Level 2 [Member] | Foreign currency forward contracts [Member]
Assets:
Total assets measured at fair value	[3]	$ 355
Liabilities:
Total liabilities measured at fair value	[3]		$ 227

[1] The fair value of pension plan assets has been determined as the surrender value of the portfolio of active insured employees held within the AXA LLP Foundation Suisse Romande collective investment fund.

[2] The fair value of short-term investments has been determined based on the quoted value of the units held in the money market fund at the balance sheet date. The short-term investments as of March 31, 2021, relate to new investments made in a Treasury Money Market Fund. See Note 1, “Summary of Significant Accounting Policies – Short-term Investments”.

[3] The fair value of foreign currency forward contracts has been determined by calculating the present value of future cash flows, estimated using market-based observable inputs including forward and spot exchange rates and interest rate curves obtained from third party market price quotations.