Supplemental balance sheet information related to leases (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Mar. 31, 2021	Sep. 30, 2020
Operating lease right-of-use assets	$ 33,790	$ 31,230	$ 35,665
Current portion of operating lease liabilities	8,985	7,898	9,105
Long-term operating lease liabilities	22,530	19,725	22,813
Total operating lease liabilities	$ 31,515	$ 27,623	$ 31,918