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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jan. 31, 2019	Jan. 31, 2018
Statement Of Financial Position [Abstract]
Accounts receivable, allowance for doubtful accounts	$ 1,499	$ 1,326
Preferred shares, par value	$ 0.0001	$ 0.0001
Preferred shares, shares authorized	10,000,000	10,000,000
Preferred shares, shares issued	0	0
Common shares, par value	$ 0.0001	$ 0.0001
Common shares, shares authorized	200,000,000	200,000,000
Common shares, shares issued	105,642,283	108,248,568
Common shares, shares outstanding	105,642,283	108,248,568

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- Definition

A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

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Face amount or stated value per share of common stock.

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer.

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