SEC Schedule, Article 12-09, Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Allowance for doubtful accounts, foreign currency translation gain	$ 700
Allowance for doubtful accounts
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of the year	2,719	$ 1,482	$ 995
Net additions / (decreases) - charged to costs and expenses	3,941	2,098	1,858
Net additions / (decreases) - charged to other accounts	(403)	(289)	118
Deductions	(2,655)	(572)	(1,489)
Balance at end of the year	3,602	2,719	1,482
Allowance for doubtful accounts | Cumulative Effect, Period of Adoption, Adjustment | ASU 2016-13
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of the year	300
Balance at end of the year		300
Deferred taxation valuation allowance
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of the year	1,010	1,784	2,244
Net additions / (decreases) - charged to costs and expenses	64	(244)	(46)
Net additions / (decreases) - charged to other accounts	(131)	(145)	69
Deductions	(195)	(385)	(483)
Balance at end of the year	$ 748	$ 1,010	$ 1,784