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Net Loss per Share Attributable to Common Stockholders - Summary of Computation of Basic and Diluted Net Loss Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Apr. 30, 2015	Apr. 30, 2014
Numerator:
Net loss	$ (47,283)us-gaap_NetIncomeLoss	$ (38,511)us-gaap_NetIncomeLoss
Add: accretion of redeemable convertible preferred stock		(43)us-gaap_TemporaryEquityAccretionToRedemptionValueAdjustment
Net loss attributable to common stockholders	(47,283)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	(38,554)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Denominator:
Weighted-average number of shares outstanding—basic and diluted	119,379us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted	13,734us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted
Net loss per share attributable to common stockholders—basic and diluted	$ (0.40)us-gaap_EarningsPerShareBasicAndDiluted	$ (2.81)us-gaap_EarningsPerShareBasicAndDiluted
Class A Common Stock
Numerator:
Net loss	(6,031)us-gaap_NetIncomeLoss / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember
Net loss attributable to common stockholders	(6,031)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember
Denominator:
Weighted-average number of shares outstanding—basic and diluted	15,226us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember
Net loss per share attributable to common stockholders—basic and diluted	$ (0.40)us-gaap_EarningsPerShareBasicAndDiluted / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember
Class B Common Stock
Numerator:
Net loss	(41,252)us-gaap_NetIncomeLoss / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember	(38,511)us-gaap_NetIncomeLoss / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember
Add: accretion of redeemable convertible preferred stock		(43)us-gaap_TemporaryEquityAccretionToRedemptionValueAdjustment / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember
Net loss attributable to common stockholders	$ (41,252)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember	$ (38,554)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember
Denominator:
Weighted-average number of shares outstanding—basic and diluted	104,153us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember	13,734us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember
Net loss per share attributable to common stockholders—basic and diluted	$ (0.40)us-gaap_EarningsPerShareBasicAndDiluted / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember	$ (2.81)us-gaap_EarningsPerShareBasicAndDiluted / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember

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The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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Amount of decrease to net income for accretion of temporary equity to its redemption value to derive net income apportioned to common stockholders.

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Average number of shares or units issued and outstanding that are used in calculating basic and diluted earnings per share (EPS).

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