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The Company and a Summary of Its Significant Accounting Policies - Additional Information (Detail) |  |  |  |  |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 03, 2017 USD ($) | Mar. 01, 2017 USD ($) a | Nov. 23, 2016 USD ($) shares | Nov. 14, 2016 USD ($) shares | Oct. 06, 2015 USD ($) a | Nov. 30, 2016 USD ($) | Mar. 31, 2017 USD ($) shares | Mar. 31, 2016 USD ($) | Apr. 03, 2015 USD ($) | Jun. 30, 2016 USD ($)
Company And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Shares issued in connection with acquisition of business, net of issuance costs |  |  |  |  |  |  | $ 4,988,000 |  |  |
Payment related to acquisition of business, net of cash acquired |  |  |  |  |  |  | 16,528,000 | $ 4,402,000 | $ 57,376,000 |
Common stock issued under public offering, net of issuance costs |  |  |  |  |  |  | 503,061,000 |  |  |
Payment related to acquisition of business, net of cash acquired |  |  |  |  |  |  | 140,378,000 | 1,258,000 |  |
Capitalized interest expense |  |  |  |  |  |  | 49,700,000 | 30,100,000 | 16,200,000 |
Number of acres land purchased | a |  |  |  |  | 23 |  |  |  |  |
Purchased land value at cost |  |  |  |  | $ 39,500,000 |  |  |  |  |
Number of acres land sold | a |  | 16 |  |  |  |  |  |  |  |
Proceed from sale of land |  | $ 27,600,000 |  |  |  |  | $ 27,559,000 |  |  |
Initial term of operating leases |  |  |  |  |  |  | 10 years |  |  |
Total capitalized costs related to patents |  |  |  |  |  |  | $ 3,200,000 | 3,200,000 |  |
Total capitalized costs related to orbital slots and other licenses |  |  |  |  |  |  | 15,400,000 | 15,400,000 |  |
Accumulated amortization of patents, orbital slots and other licenses |  |  |  |  |  |  | 2,100,000 | 1,700,000 |  |
Debt issuance costs capitalized |  |  |  |  |  |  | 6,100,000 |  | 3,500,000 |
Goodwill and other intangible assets impairment |  |  |  |  |  |  | $ 0 | 0 | 0 |
Maximum warranty periods provided on limited warranty |  |  |  |  |  |  | 5 years |  |  |
Forward loss related to loss contracts |  |  |  |  |  |  | $ 6,000,000 | 5,100,000 | 600,000 |
Defense contract audit agency completed cost audits |  |  |  |  |  |  | Contract costs on U.S. government contracts are subject to audit and review by the Defense Contracting Management Agency (DCMA), the Defense Contract Audit Agency (DCAA), and other U.S. government agencies, as well as negotiations with U.S. government representatives. The Company’s incurred cost audits by the DCAA have not been concluded for fiscal year 2016. As of March 31, 2017, the DCAA had completed its incurred cost audit for fiscal year 2004 and approved the Company’s incurred cost claims for fiscal years 2005 through 2015 without further audit. Although the Company has recorded contract revenues subsequent to fiscal year 2015 based upon an estimate of costs that the Company believes will be approved upon final audit or review, the Company does not know the outcome of any ongoing or future audits or reviews and adjustments, and if future adjustments exceed the Company’s estimates, its profitability would be adversely affected. |  |  |
Advertising costs |  |  |  |  |  |  | $ 4,800,000 | $ 12,200,000 | $ 17,000,000 |
Government Contracts Concentration Risk [Member] | Sales Revenue, Net [Member] |  |  |  |  |  |  |  |  |  |
Company And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Concentration risk, percentage |  |  |  |  |  |  | 28.80% | 23.70% | 22.80% |
Government Contracts Concentration Risk [Member] | Accounts Receivable [Member] |  |  |  |  |  |  |  |  |  |
Company And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Concentration risk, percentage |  |  |  |  |  |  | 30.10% | 22.80% |  |
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] |  |  |  |  |  |  |  |  |  |
Company And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Concentration risk, percentage |  |  |  |  |  |  | 19.60% | 19.40% | 21.10% |
Minimum [Member] |  |  |  |  |  |  |  |  |  |
Company And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Property, equipment and satellites, estimated useful life (years) |  |  |  |  |  |  | 2 years |  |  |
Initial term of operating leases |  |  |  |  |  |  | 1 year |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |
Company And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Property, equipment and satellites, estimated useful life (years) |  |  |  |  |  |  | 24 years |  |  |
Initial term of operating leases |  |  |  |  |  |  | 15 years |  |  |
Property and Equipment, Net [Member] |  |  |  |  |  |  |  |  |  |
Company And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Property and equipment |  |  |  |  |  |  | $ 1,202,589,000 | $ 1,050,886,000 |  |
Accumulated depreciation and amortization |  |  |  |  |  |  | $ 661,981,000 | 563,976,000 |  |
CPE Leased Equipment [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |
Company And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Property, equipment and satellites, estimated useful life (years) |  |  |  |  |  |  | 4 years |  |  |
CPE Leased Equipment [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |
Company And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Property, equipment and satellites, estimated useful life (years) |  |  |  |  |  |  | 5 years |  |  |
CPE Leased Equipment [Member] | Property and Equipment, Net [Member] |  |  |  |  |  |  |  |  |  |
Company And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Property and equipment |  |  |  |  |  |  | $ 271,917,000 | 260,409,000 |  |
Accumulated depreciation and amortization |  |  |  |  |  |  | $ 158,200,000 | 136,400,000 |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |
Company And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Shares issued in connection with acquisition of business, net of issuance costs | shares |  |  |  |  |  |  | 61,888 |  |  |
Common stock issued under public offering, net of issuance costs | shares |  |  | 7,475,000 |  |  |  | 7,475,000 |  |  |
Common stock issued under public offering, net of issuance costs |  |  |  |  |  |  | $ 1,000 |  |  |
Paid-in Capital [Member] |  |  |  |  |  |  |  |  |  |
Company And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Shares issued in connection with acquisition of business, net of issuance costs |  |  |  |  |  |  | 4,988,000 |  |  |
Common stock issued under public offering, net of issuance costs |  |  | $ 503,100,000 |  |  |  | 503,060,000 |  |  |
Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |
Company And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Payments of revolving credit facility borrowings |  |  |  |  |  | $ 225,000,000 | $ 270,000,000 | 205,000,000 | $ 245,000,000 |
Euro Retail Co [Member] | Eutelsat [Member] |  |  |  |  |  |  |  |  |  |
Company And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Ownership percentage of issued shares of an entity | 49.00% |  |  |  |  |  |  |  |  |
Arconics [Member] |  |  |  |  |  |  |  |  |  |
Company And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Purchase price of acquisition of business |  |  |  | $ 21,600,000 |  |  |  |  |  |
Shares issued in connection with acquisition of business, net of issuance costs |  |  |  | $ 5,000,000 |  |  |  |  |  |
Shares issued in connection with acquisition of business, net of issuance costs | shares |  |  |  | 61,888 |  |  |  |  |  |
Cash consideration related to acquisition of business |  |  |  | $ 16,600,000 |  |  |  |  |  |
Cash acquired from acquisition of business |  |  |  | 600,000 |  |  |  |  |  |
Payment related to acquisition of business, net of cash acquired |  |  |  | $ 16,000,000 |  |  |  |  |  |
Engreen [Member] |  |  |  |  |  |  |  |  |  |
Company And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Purchase price of the acquisition |  |  |  |  |  |  |  |  |  | $ 5,300,000
Euro Infrastructure Co [Member] |  |  |  |  |  |  |  |  |  |
Company And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Ownership percentage of issued shares of an entity | 49.00% |  |  |  |  |  | 49.00% |  |  |
Payments, net of transaction costs, to acquire the issued shares in investment | $ 139,500,000 |  |  |  |  |  |  |  |  |
Transaction costs | 2,400,000 |  |  |  |  |  |  |  |  |
Payment related to acquisition of business, net of cash acquired | $ 141,900,000 |  |  |  |  |  |  |  |  |
Unfavorable Regulatory Action [Member] |  |  |  |  |  |  |  |  |  |
Company And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
U.S. government contract-related reserves |  |  |  |  |  |  | $ 1,800,000 | $ 2,500,000 |  |

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