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Discontinued Operations - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 0 Months Ended | 3 Months Ended
--- | --- | ---
Jan. 31, 2013 | May 03, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Proceeds from sale |  | $ 1,800
Period of transition services and manufacturing, Maximum |  | 12 months
Transition Service Agreement expiration date |  | Jan. 31, 2014
Amount received from disposition of inventory |  | (2,355)
Grass Technologies Product Group [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Proceeds from sale | 18,600 | 1,800
Amount received from disposition of inventory |  | $ 2,355

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