Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Mar. 31, 2019
Cash flows from operating activities:
Net loss	$ (9,737)	$ (35,497)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation	68,802	63,793
Amortization of intangible assets	15,210	14,004
Stock-based compensation expense	21,227	19,126
Loss on disposition of fixed assets	13,134	12,549
Other non-cash adjustments	(5,367)	(29,148)
Increase (decrease) in cash resulting from changes in operating assets and liabilities, net of effect of acquisition:
Accounts receivable	(5,472)	24,125
Inventories	(29,252)	(22,245)
Other assets	(13,595)	(10,812)
Accounts payable	(3,869)	(386)
Accrued liabilities	(8,000)	12,226
Other liabilities	3,383	6,079
Net cash provided by operating activities	46,464	53,814
Cash flows from investing activities:
Purchase of property, equipment and satellites	(166,115)	(146,633)
Cash paid for patents, licenses and other assets	(21,936)	(12,155)
Proceeds from insurance claims on ViaSat-2 satellite	2,277			$ 185,700
Payment related to acquisition of business, net of cash acquired		(2,070)
Net cash used in investing activities	(185,774)	(160,858)
Cash flows from financing activities:
Payment of debt issuance costs	(2,479)
Proceeds from issuance of common stock under equity plans	24,377	7,655
Purchase of common stock in treasury (immediately retired) related to tax withholdings for stock-based compensation	(2,328)	(5,969)
Other financing activities	(255)	(2,376)
Net cash provided by financing activities	7,494	91,660
Effect of exchange rate changes on cash	(2)	(1,273)
Net decrease in cash and cash equivalents	(131,818)	(16,657)
Cash and cash equivalents at beginning of period	261,701	71,446	$ 54,789	71,446
Cash and cash equivalents at end of period	129,883	54,789	$ 129,883	$ 261,701
Non-cash investing and financing activities:
Issuance of common stock in satisfaction of certain accrued employee compensation liabilities	22,829	32,129
Capital expenditures not paid for	10,250	7,637
Ex-Im Credit Facility [Member]
Cash flows from financing activities:
Payments of credit facility borrowings	$ (11,821)	(22,650)
Revolving Credit Facility [Member]
Cash flows from financing activities:
Proceeds from credit facility borrowings		130,000
Payments of credit facility borrowings		$ (15,000)