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Composition of Certain Balance Sheet Captions - Composition of Certain Balance Sheet Captions (Parenthetical) (Detail) | 6 Months Ended
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Sep. 30, 2017
Minimum [Member] |
Schedule Of Composition Of Certain Balance Sheet Captions [Line Items] |
Property, equipment and satellites, estimated useful life (years) | 2 years
Maximum [Member] |
Schedule Of Composition Of Certain Balance Sheet Captions [Line Items] |
Property, equipment and satellites, estimated useful life (years) | 24 years
Satellites [Member] | Minimum [Member] |
Schedule Of Composition Of Certain Balance Sheet Captions [Line Items] |
Property, equipment and satellites, estimated useful life (years) | 10 years
Satellites [Member] | Maximum [Member] |
Schedule Of Composition Of Certain Balance Sheet Captions [Line Items] |
Property, equipment and satellites, estimated useful life (years) | 17 years
Capital Lease of Satellite Capacity - Anik F2 [Member] |
Schedule Of Composition Of Certain Balance Sheet Captions [Line Items] |
Property, equipment and satellites, estimated useful life (years) | 10 years
Equipment and Software [Member] | Minimum [Member] |
Schedule Of Composition Of Certain Balance Sheet Captions [Line Items] |
Property, equipment and satellites, estimated useful life (years) | 2 years
Equipment and Software [Member] | Maximum [Member] |
Schedule Of Composition Of Certain Balance Sheet Captions [Line Items] |
Property, equipment and satellites, estimated useful life (years) | 7 years
CPE Leased Equipment [Member] | Minimum [Member] |
Schedule Of Composition Of Certain Balance Sheet Captions [Line Items] |
Property, equipment and satellites, estimated useful life (years) | 4 years
CPE Leased Equipment [Member] | Maximum [Member] |
Schedule Of Composition Of Certain Balance Sheet Captions [Line Items] |
Property, equipment and satellites, estimated useful life (years) | 5 years
Furniture and Fixtures [Member] |
Schedule Of Composition Of Certain Balance Sheet Captions [Line Items] |
Property, equipment and satellites, estimated useful life (years) | 7 years
Leasehold Improvements [Member] | Minimum [Member] |
Schedule Of Composition Of Certain Balance Sheet Captions [Line Items] |
Property, equipment and satellites, estimated useful life (years) | 2 years
Leasehold Improvements [Member] | Maximum [Member] |
Schedule Of Composition Of Certain Balance Sheet Captions [Line Items] |
Property, equipment and satellites, estimated useful life (years) | 17 years
Building [Member] |
Schedule Of Composition Of Certain Balance Sheet Captions [Line Items] |
Property, equipment and satellites, estimated useful life (years) | 24 years
Technology [Member] |
Schedule Of Composition Of Certain Balance Sheet Captions [Line Items] |
Other acquired intangible assets, weighted average useful life | 6 years
Contracts and Customer Relationships [Member] |
Schedule Of Composition Of Certain Balance Sheet Captions [Line Items] |
Other acquired intangible assets, weighted average useful life | 7 years
Satellite Co-Location Rights [Member] |
Schedule Of Composition Of Certain Balance Sheet Captions [Line Items] |
Other acquired intangible assets, weighted average useful life | 9 years
Trade Name [Member] |
Schedule Of Composition Of Certain Balance Sheet Captions [Line Items] |
Other acquired intangible assets, weighted average useful life | 3 years
Other [Member] |
Schedule Of Composition Of Certain Balance Sheet Captions [Line Items] |
Other acquired intangible assets, weighted average useful life | 6 years

X
- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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- Definition Extended line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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