Fair Value of Financial Instruments - Financial assets and liabilities measured at fair value on a recurring basis (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Mar. 31, 2020
Liabilities:
Contingent consideration	$ 19,495
Fair Value Measurements Recurring
Investments:
Time deposits-current	3,307	$ 3,927
Equity securities - current	728	5,858
Equity securities - non-current	7	4
Derivative financial instruments:
Foreign currency derivative contracts-current	560	103
Foreign currency derivative contracts-non-current	379	56
Total assets	4,981	9,948
Liabilities:
Foreign currency derivative contracts-current	2,017	3,689
Foreign currency derivative contracts-non-current		364
Interest rate swap contracts - non-current	11,153	11,128
Contingent consideration	19,495	25,012
Total liabilities	32,665	40,193
Fair Value Measurements Recurring | Fair Value Inputs Level2
Investments:
Time deposits-current	3,307	3,927
Equity securities - current	728	5,858
Equity securities - non-current	7	4
Derivative financial instruments:
Foreign currency derivative contracts-current	560	103
Foreign currency derivative contracts-non-current	379	56
Total assets	4,981	9,948
Liabilities:
Foreign currency derivative contracts-current	2,017	3,689
Foreign currency derivative contracts-non-current		364
Interest rate swap contracts - non-current	11,153	11,128
Total liabilities	13,170	15,181
Fair Value Measurements Recurring | Fair Value Inputs Level 3
Liabilities:
Contingent consideration	19,495	25,012
Total liabilities	$ 19,495	$ 25,012