Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Cash flows from operating activities:
Net loss	$ (71,832)	$ (48,759)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation	195,562	153,211
Amortization of intangible assets	42,543	33,165
Deferred income taxes	(37,137)	(19,940)
Stock-based compensation expense	58,658	49,132
Loss on disposition of fixed assets	38,374	25,768
Loss on extinguishment of debt		10,217
Other non-cash adjustments	9,229	4,685
Increase (decrease) in cash resulting from changes in operating assets and liabilities, net of effect of acquisition:
Accounts receivable	(38,909)	29,626
Inventories	(32,250)	(24,148)
Other assets	(15,430)	(24,938)
Accounts payable	4,234	5,804
Accrued liabilities	52,534	16,965
Other liabilities	9,085	71,807
Net cash provided by operating activities	214,661	282,595
Cash flows from investing activities:
Purchase of property, equipment and satellites	(491,839)	(354,362)
Cash paid for patents, licenses and other assets	(32,500)	(55,249)
Proceeds from insurance claims on ViaSat-2 satellite	172,206
Proceeds from sale of real property	14,034
Other investing activities	(2,339)
Net cash used in investing activities	(340,438)	(409,611)
Cash flows from financing activities:
Payment of debt issuance costs		(9,759)
Proceeds from issuance of common stock under equity plans	23,595	25,732
Purchase of common stock in treasury (immediately retired) related to tax withholdings for share-based awards	(28,108)	(23,663)
Other financing activities	(9,735)	(1,267)
Net cash provided by financing activities	100,637	157,944
Effect of exchange rate changes on cash	(2,941)	795
Net (decrease) increase in cash and cash equivalents	(28,081)	31,723
Cash and cash equivalents at beginning of period	71,446	130,098
Cash and cash equivalents at end of period	43,365	161,821
Non-cash investing and financing activities:
Issuance of common stock in satisfaction of certain accrued employee compensation liabilities	32,129	16,409
Capital expenditures not paid for	34,237	27,086
2020 Notes [Member]
Adjustments to reconcile net loss to net cash provided by operating activities:
Loss on extinguishment of debt		10,217
Cash flows from financing activities:
Repayment of 2020 Notes		(575,000)
Payment of debt extinguishment costs		(10,602)
2025 Notes [Member]
Cash flows from financing activities:
Proceeds from issuance of 2025 Notes		700,000
Revolving Credit Facility [Member]
Cash flows from financing activities:
Proceeds from credit facility borrowings	465,000
Payments of credit facility borrowings	(140,000)
Ex-Im Credit Facility [Member]
Cash flows from financing activities:
Proceeds from credit facility borrowings		52,503
Payments of credit facility borrowings	$ (210,115)
Non-cash investing and financing activities:
Exposure fees on Ex-Im credit facility financed through Ex-Im credit facility		$ 5,764