Divestiture and Discontinued Operations - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified |
3 Months Ended | 6 Months Ended | |
---|---|---|---|
Jul. 31, 2013
|
Jul. 31, 2012
|
Oct. 31, 2013
|
|
Divestitures [Line Items] | |||
Undiscounted purchase consideration paid in installments | 5 years | 21 years | |
Loss on disposal of discontinued operations, net of tax | $ (378) | $ (378) | |
Bio Fuels Assets [Member]
|
|||
Divestitures [Line Items] | |||
Undiscounted purchase consideration | 2,000 | ||
Maine Energy Facility [Member]
|
|||
Divestitures [Line Items] | |||
Undiscounted purchase consideration | $ 6,650 |