Note 2 — Composition of Certain Balance Sheet Captions

	As of September 30, 2018			As of March 31, 2018
	(In thousands)
Accounts receivable, net:
Billed	$	188,915		$	184,536
Unbilled		81,592			85,156
Allowance for doubtful accounts		(1,704	)		(2,027	)
	$	268,803		$	267,665
Inventories:
Raw materials	$	74,995		$	62,252
Work in process		51,704			47,465
Finished goods		105,379			86,590
	$	232,078		$	196,307
Prepaid expenses and other current assets:
Prepaid expenses	$	80,984		$	68,516
Insurance receivable		133,020			—
Other		19,254			8,619
	$	233,258		$	77,135
Satellites, net:
Satellites (estimated useful life of 10-17 years)	$	978,098		$	1,152,503
Capital lease of satellite capacity — Anik F2 (estimated useful life of 10 years)		99,090			99,090
Satellites under construction		459,222			362,342
		1,536,410			1,613,935
Less: accumulated depreciation and amortization		(412,336	)		(373,948	)
	$	1,124,074		$	1,239,987
Property and equipment, net:
Equipment and software (estimated useful life of 2-7 years)	$	939,026		$	864,140
CPE leased equipment (estimated useful life of 4-5 years)		341,308			298,746
Furniture and fixtures (estimated useful life of 7 years)		39,952			35,234
Leasehold improvements (estimated useful life of 2-17 years)		115,300			111,841
Building (estimated useful life of 24 years)		8,923			8,923
Land		2,291			15,322
Construction in progress		158,173			108,192
		1,604,973			1,442,398
Less: accumulated depreciation		(778,674	)		(719,910	)
	$	826,299		$	722,488
Other acquired intangible assets, net:
Technology (weighted average useful life of 6 years)	$	89,094		$	90,652
Contracts and customer relationships (weighted average useful life of 7 years)		103,421			103,808
Satellite co-location rights (weighted average useful life of 9 years)		8,600			8,600
Trade name (weighted average useful life of 3 years)		5,940			5,940
Other (weighted average useful life of 6 years)		10,035			10,137
		217,090			219,137
Less: accumulated amortization		(191,018	)		(187,275	)
	$	26,072		$	31,862
Other assets:
Investment in unconsolidated affiliate	$	160,559		$	163,835
Deferred income taxes		255,292			222,274
Capitalized software costs, net		244,729			246,792
Patents, orbital slots and other licenses, net		16,800			16,100
Other		67,360			37,133
	$	744,740		$	686,134
Accrued liabilities:
Collections in excess of revenues and deferred revenues	$	108,977		$	121,439
Accrued employee compensation		28,614			46,106
Accrued vacation		40,032			39,022
Warranty reserve, current portion		5,196			5,357
Other		67,588			51,752
	$	250,407		$	263,676
Other liabilities:
Deferred revenues, long-term portion	$	81,740		$	77,831
Deferred rent, long-term portion		15,378			13,769
Warranty reserve, long-term portion		1,712			1,557
Satellite performance incentive obligations, long-term portion		25,465			18,181
Other		5,971			9,902
	$	130,266		$	121,240