Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Mar. 31, 2023
Income Tax Disclosure [Abstract]
Net operating loss and other credit carryforwards	$ 223,459	$ 302,273
Inventory	17,328	23,584
Accruals and reserves	18,841	21,336
Interest carryforward	96,115	103,826
Pension and other postretirement benefits	69,828	87,846
Lease right-of-use assets	4,650	5,259
Research and development	9,283	4,592
Acquired contract liabilities, net	2,329	3,012
Deferred tax assets, gross	441,833	551,728
Valuation allowance	(399,179)	(512,579)
Net deferred tax assets	42,654	39,149
Deferred revenue	3,473	2,947
Property and equipment	10,632	11,487
Goodwill and other intangible assets	30,457	26,197
Lease liabilities	3,187	3,470
Prepaid expenses and other	2,173	2,316
Deferred tax liabilities	49,922	46,417
Net deferred tax liabilities	$ 7,268	$ 7,268