Stockholders' Equity Stock-based Compensation (Details) (USD $)	12 Months Ended
Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Expected dividend yield	0.00%
2011 Incentive Plan \| Common Stock
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Shares available for grant	1,223,512
2011 Employee Stock Purchase Plan \| Common Stock
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Shares available for grant	117,266
2011 Employee Stock Purchase Plan \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Risk-free interest rate	0.06%	0.09%	0.12%
Expected dividend yield	0.00%	0.00%	0.00%
Expected lives (in years)	6 months	6 months	6 months
Expected volatility	49.49%	36.72%	34.75%
2011 Employee Stock Purchase Plan \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Risk-free interest rate	0.12%	0.09%	0.15%
Expected dividend yield	0.00%	0.00%	0.00%
Expected lives (in years)	6 months	6 months	6 months
Expected volatility	60.43%	46.58%	46.42%
2011 Incentive Plan and Prior Incentive Plans \| Common Stock
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Shares reserved for issuance	4,295,075
iTVX, Inc.
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation recognized in results of continuing operations as a component of operating expenses	(200,000)	2,700,000
Property and Equipment
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation capitalized as a component of property and equipment	754,000	1,614,000	512,000
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant-date per share fair value of stock options granted (usd per share)	18.99	8.60	9.27
Total intrinsic value of stock options exercised	29,507,000	6,227,000	662,000
Cash received from options exercised and shares purchased under all share-based arrangements	5,839,000	2,965,000	259,000
Tax deduction related to stock options exercised	0	0	(10,000)
Shares used to pay for the cost and taxes associated with option exercises	5,600,000	1,100,000	100,000
Stock Options \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Risk-free interest rate	1.28%	1.12%	0.49%
Expected dividend yield	0.00%	0.00%	0.00%
Expected lives (in years)	4 years 1 month	4 years	3 years 9 months
Expected volatility	49.98%	46.44%	40.41%
Stock Options \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Risk-free interest rate	1.28%	1.12%	1.77%
Expected dividend yield	0.00%	0.00%	0.00%
Expected lives (in years)	4 years 1 month	4 years	7 years 9 months
Expected volatility	49.98%	46.44%	49.36%
Other Than Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant-date per share fair value of RSUs and DSUs (usd per share)	52.82	36.72	17.64
Stock Options Non Employee \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Risk-free interest rate	1.38%	1.32%	0.17%
Expected dividend yield	0.00%	0.00%	0.00%
Expected lives (in years)	6 years 1 month	7 years 2 months	7 months
Expected volatility	45.04%	40.64%	39.06%
Stock Options Non Employee \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Risk-free interest rate	2.27%	2.56%	1.77%
Expected dividend yield	0.00%	0.00%	0.00%
Expected lives (in years)	7 years 1 month	8 years 2 months	9 years 1 month
Expected volatility	50.71%	49.48%	47.52%
DISH SARs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation recognized in results of continuing operations as a component of operating expenses			15,900,000
Discontinued Operations
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation recognized in results of continuing operations as a component of operating expenses	283,000	397,000	384,000
Selling, general and administrative expenses \| DISH SARs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation recognized in results of continuing operations as a component of operating expenses			15,900,000
Operating Expenses
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation recognized in results of continuing operations as a component of operating expenses	7,625,000	8,058,000	21,408,000

Adjustments Related to Option Exercises and Tax Withholding for Share-based Compensation

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Aggregate number of common shares reserved for future issuance.

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Represents the compensation cost capitalized during the period arising from equity-based compensation arrangements (for example, shares of stock, units, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Aggregate proceeds received by the entity during the annual period from exercises of stock or unit options and conversion of similar instruments granted under equity-based payment arrangements.

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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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