CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Jul. 31, 2014	Apr. 30, 2014
Allowance for doubtful accounts	$ 10,371	$ 9,513
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	150,000	150,000
Common stock, shares issued	62,757	62,282
Common stock, shares outstanding	50,286	49,811