Condensed Consolidated Statements of Cash Flows (Unaudited) $ in Thousands	9 Months Ended
	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Cash flows from operating activities:
Net (loss) income	$ (48,759)	$ 17,518
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation	153,211	150,881
Amortization of intangible assets	33,165	32,517
Deferred income taxes	(19,940)	3,083
Equity in income of unconsolidated affiliate, net	(1,593)
Stock-based compensation expense	49,132	39,923
Loss on disposition of fixed assets	25,768	26,995
Loss on extinguishment of debt	10,217
Other non-cash adjustments	6,278	7,077
Increase (decrease) in cash resulting from changes in operating assets and liabilities, net of effect of acquisition:
Accounts receivable	29,626	26,673
Inventories	(24,148)	(9,752)
Other assets	(24,938)	(11,123)
Accounts payable	5,804	(7,827)
Accrued liabilities	16,965	34,219
Other liabilities	71,807	2,495
Net cash provided by operating activities	282,595	312,679
Cash flows from investing activities:
Purchase of property, equipment and satellites	(354,362)	(390,223)
Cash paid for patents, licenses and other assets	(55,249)	(56,013)
Payments related to acquisition of businesses, net of cash acquired		(16,528)
Other investing activities		(649)
Net cash used in investing activities	(409,611)	(463,413)
Cash flows from financing activities:
Payment of debt issuance costs	(9,759)	(6,677)
Proceeds from issuance of common stock under equity plans	25,732	22,403
Purchase of common stock in treasury (immediately retired) related to tax withholdings for stock-based compensation	(23,663)	(21,150)
Proceeds from common stock issued in public offering, net of issuance costs		503,061
Other financing activities	(1,267)	(1,146)
Net cash provided by financing activities	157,944	393,960
Effect of exchange rate changes on cash	795	(371)
Net increase in cash and cash equivalents	31,723	242,855
Cash and cash equivalents at beginning of period	130,098	42,088
Cash and cash equivalents at end of period	161,821	284,943
Non-cash investing and financing activities:
Issuance of common stock in satisfaction of certain accrued employee compensation liabilities	16,409	13,080
Capital expenditures not paid for	27,086	10,918
Issuance of common stock in connection with acquisition		4,988
Revolving Credit Facility [Member]
Cash flows from financing activities:
Proceeds from credit facility borrowings		90,000
Payments of revolving credit facility borrowings		(270,000)
Ex-Im Credit Facility [Member]
Cash flows from financing activities:
Proceeds from credit facility borrowings	52,503	77,469
Non-cash investing and financing activities:
Exposure fees on Ex-Im credit facility financed through Ex-Im credit facility	5,764	$ 8,505
2020 Notes [Member]
Adjustments to reconcile net (loss) income 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