Shares Used In Computing Diluted Net Income Per Share (Details)	3 Months Ended
Jul. 01, 2011	Jul. 02, 2010
Shares used in computing diluted net income per share
Shares used in computing basic net income per share	41,803,000	39,968,000
Options to purchase common stock as determined by application of the treasury stock method	1,435,000	1,615,000
Restricted stock units to acquire common stock as determined by application of the treasury stock method	373,000	381,000
Potentially issuable shares in connection with certain terms of the amended ViaSat 401(k) Profit Sharing Plan	136,000	149,000
Employee Stock Purchase Plan equivalents	2,000	12,000
Shares used in computing diluted net income per share attributable to ViaSat, Inc. common stockholders	43,749,000	42,125,000
Stock Options [Member]
Shares Used In Computing Diluted Net Income Per Share (Textuals) [Abstract]
Antidilutive shares	241,525	345,700
Restricted Stock [Member]
Shares Used In Computing Diluted Net Income Per Share (Textuals) [Abstract]
Antidilutive shares	4,824	0

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 13, 14

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 171

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 40
-Subparagraph c

+ Details

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- Definition

Aggregate awards of share options and nonvested shares to be issued to an employee under a share-based compensation arrangement are considered options for purposes of computing diluted earnings per share. Such share-based awards shall be considered to be outstanding as of the grant date for purposes of computing diluted earnings per share even though their exercise may be contingent upon vesting. Those share-based awards are included in the diluted Earnings Per Share (EPS) computation even if the employee may not receive (or be able to sell) the stock until some future date. Accordingly, all shares to be issued shall be included in computing diluted EPS if the effect is dilutive. The dilutive effect of share-based compensation arrangements shall be computed using the treasury stock method. If the equity share options or other equity instruments are outstanding for only part of a period, the shares issuable shall be weighted to reflect the portion of the period during which the equity instruments were outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 20

+ Details

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- Definition

The average number of shares issued and outstanding that are used in calculating diluted EPS, determined based on the timing of issuance of shares in the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 40
-Subparagraph a

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 8

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- Definition

Number of [basic] shares, after adjustment for contingently issuable shares and other shares not deemed outstanding, determined by relating the portion of time within a reporting period that common shares have been outstanding to the total time in that period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 171

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 40
-Subparagraph a

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 8

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- Definition

Antidilutive stock options excluded from computation of earnings per share.

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- Definition

Potentially issuable shares in connection with certain terms of the amended ViaSat 401 (k) profit sharing plan and are included in the computation of diluted Earnings Per Share.

+ Details

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- Definition

Aggregate awards of nonvested shares to be issued to employees under a share-based compensation arrangement are considered restricted unit awards for purposes of computing diluted earnings per share. Such share-based awards shall be considered to be outstanding as of the grant date for purposes of computing diluted earnings per share even though their release may be contingent upon vesting. Those share-based awards are included in the diluted Earnings Per Share (EPS) computation even if the employees may not receive (or be able to sell) the stock until some future date. Accordingly, all shares to be issued shall be included in computing diluted EPS if the effect is dilutive. The dilutive effect of share-based compensation arrangements shall be computed using the treasury stock method. If the equity share options or other equity instruments are outstanding for only part of a period, the shares issuable shall be weighted to reflect the portion of the period during which the equity instruments were outstanding.

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- Definition

Shares issued per employee stock purchase plan and included in the computation of diluted Earnings Per Share.

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