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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jan. 31, 2020	Apr. 30, 2019
Statement Of Financial Position [Abstract]
Allowance for doubtful accounts receivable	$ 2,010	$ 1,899
Preferred stock, par value	$ 0.001	$ 0.001
Preferred stock, shares authorized	20,000,000	20,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	73,234,996	72,863,624
Common stock, shares outstanding	55,068,134	54,696,762
Treasury stock, shares	18,166,862	18,166,862

X

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

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