Consolidated Balance Sheets (Parenthetical) $ in Thousands	Apr. 30, 2020 USD ($) $ / shares shares	Apr. 30, 2020 € / shares	Apr. 30, 2019 USD ($) $ / shares shares	Apr. 30, 2019 € / shares
Allowance for doubtful accounts \| $	$ 1,247		$ 1,411
Ordinary shares, shares authorized (in shares)	165,000,000
Treasury stock, shares (in shares)	35,937		35,937
Average treasury stock repurchase price ( in $ / shares) \| $ / shares	$ 10.30		$ 10.30
Convertible Preference Shares
Preference shares, par value ( in € / shares) \| € / shares		€ 0.01		€ 0.01
Preference shares, shares authorized (in shares)	165,000,000		165,000,000
Preference shares, shares issued (in shares)	0		0
Preference shares, shares outstanding (in shares)	0		0
Ordinary Shares, Par Value of €0.01
Ordinary shares, par value ( in € / shares) \| € / shares		€ 0.01		€ 0.01
Ordinary shares, shares authorized (in shares)	165,000,000		165,000,000
Ordinary shares, shares issued (in shares)	82,856,978		73,675,083
Ordinary shares, shares outstanding (in shares)	82,856,978		73,675,083

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Amount of allowance for credit loss on accounts receivable, classified as current.

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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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