Development Project Charges - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified |
3 Months Ended | 12 Months Ended | |
---|---|---|---|
Oct. 31, 2011
|
Apr. 30, 2012
|
Apr. 30, 2013
|
|
Collaborative Arrangements Non collaborative Arrangements And Business Acquisitions Transactions [Line Items] | |||
Deferred costs associated with development projects | $ 131 | $ 131 | |
Deferred project costs | $ 1,163 | $ 1,644 |