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Employee Benefit Plan	12 Months Ended
Employee Benefit Plan	Apr. 30, 2015
Postemployment Benefits [Abstract]
Employee Benefit Plan	16. Employee Benefit Plan On April 7, 2006, the Company adopted a defined contribution retirement plan qualifying under Section 401(k) of the Internal Revenue Code of 1986. It is the sole discretion of the Company to match eligible employee contributions in the form of cash. The Company contributed $0.7 million and $0.9 million in matching contributions to the 401(k) plan in the fiscal year ended April 30, 2015 and 2014, respectively. The Company had not made contributions prior to fiscal year 2014.