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Retirement Plan	12 Months Ended
Retirement Plan	Apr. 30, 2017
Retirement Plan
Retirement Plan	8. Retirement Plan The Company maintains a 401(k) defined contribution retirement plan for its employees. Participants are allowed to choose from a selection of mutual funds in order to designate how both employer and employee contributions are invested. Under the plan, the Company matches 50% of each employee's contributions on the first 4% of the employee's compensation contributed. The Company contributed $3,665, $1,743, and $1,120, in fiscal 2017, 2016, and 2015, respectively.