Annual report pursuant to Section 13 and 15(d)

Supplemental Balance Sheet Information - Additional Information (Detail)

v2.4.0.6
Supplemental Balance Sheet Information - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
Apr. 30, 2013
Apr. 30, 2012
Supplemental Balance Sheet Information [Line Items]    
Deferred revenue $ 33.8 $ 13.5