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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Jan. 31, 2016
Apr. 30, 2015
Statement Of Financial Position [Abstract]    
Allowance for doubtful accounts receivable $ 709 $ 722
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 70,671,290 69,625,081
Common stock, shares outstanding 55,108,668 54,062,459
Treasury stock, shares 15,562,622 15,562,622