Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Cash flows from operating activities:
Net loss	$ (61,095)	$ (23,138)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation	128,990	101,659
Amortization of intangible assets	28,281	23,150
Deferred income taxes	(40,528)	(21,313)
Stock-based compensation expense	38,503	31,490
Loss on disposition of fixed assets	26,025	17,853
Loss on extinguishment of debt		10,217
Other non-cash adjustments	7,775	4,253
Increase (decrease) in cash resulting from changes in operating assets and liabilities:
Accounts receivable	(10,595)	7,657
Inventories	(34,173)	(12,455)
Other assets	(9,771)	(18,277)
Accounts payable	19,908	(7,744)
Accrued liabilities	10,396	5,984
Other liabilities	7,576	66,490
Net cash provided by operating activities	111,292	185,826
Cash flows from investing activities:
Purchase of property, equipment and satellites	(333,466)	(206,627)
Cash paid for patents, licenses and other assets	(21,692)	(36,969)
Proceeds from insurance claims on ViaSat-2 satellite	44,394
Proceeds from sale of real property	14,034
Other investing activities	(2,339)
Net cash used in investing activities	(299,069)	(243,596)
Cash flows from financing activities:
Payment of debt issuance costs		(8,735)
Proceeds from issuance of common stock under equity plans	11,087	14,871
Purchase of common stock in treasury (immediately retired) related to tax withholdings for share-based awards	(6,551)	(2,483)
Other financing activities	(3,886)	(757)
Net cash provided by financing activities	169,264	169,797
Effect of exchange rate changes on cash	(1,306)	583
Net (decrease) increase in cash and cash equivalents and restricted cash	(19,819)	112,610
Cash and cash equivalents and restricted cash at beginning of period	71,446	130,098
Cash and cash equivalents and restricted cash at end of period	51,627	242,708
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	6,724	13,003
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	355,000
Payments of credit facility borrowings	(130,000)
Ex-Im Credit Facility [Member]
Cash flows from financing activities:
Proceeds from credit facility borrowings		52,503
Payments of credit facility borrowings	$ (56,386)
Non-cash investing and financing activities:
Exposure fees on Ex-Im credit facility financed through Ex-Im credit facility		$ 5,764