v2.4.0.8

Stock options (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	9 Months Ended	12 Months Ended
	Oct. 31, 2014	Jan. 31, 2014
Number of options
Opening balance	6,369
Granted	1,946
Exercised	(1,793)
Forfeited	(169)
Ending balance	6,353	6,369
Range of exercise prices (usd per share)
Beginning balance, minimum	$ 1.10
Beginning balance, maximum	$ 4.50
Granted, minimum	$ 14.00
Granted, maximum	$ 18.93
Exercised, minimum	$ 0.50
Exercised, maximum	$ 2.50
Forfeited, minimum	$ 1.25
Forfeited, maximum	$ 14.00
Ending balance, minimum	$ 1.10	$ 1.10
Ending balance, maximum	$ 18.93	$ 4.50
Weighted- average exercise price (usd per share)
Opening balance	$ 1.77
Granted	$ 14.29
Exercised	$ 1.3370
Forfeited	$ 9.97
Ending balance	$ 4.79	$ 1.77
Weighted- average contractual term (in years)	7 years 0 months 10 days	6 years 4 months 2 days
Aggregate intrinsic value	$ 99,157	$ 14,621

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Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit, Exercised

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Weighted average price of options that were either forfeited or expired.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Gross number of share options (or share units) granted during the period.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Number of share options (or share units) exercised during the current period.

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