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Segment Reporting - Financial Information by Business Segment (Assets) (Detail) - USD ($) $ in Thousands | Jan. 31, 2018 | Jan. 31, 2017 | Jan. 31, 2016
--- | --- | --- | ---
Segment Reporting Information [Line Items] |  |  |
Fixed assets, net | $ 22,900 | $ 43,838 | $ 73,516
Intangible assets, net | 8,015 | 9,012 | 10,466
Goodwill | 2,531 | 3,997 | 4,155
Total Assets | 73,679 | 94,714 | 134,759
Marine Technology Products |  |  |
Segment Reporting Information [Line Items] |  |  |
Fixed assets, net | 3,790 | 4,036 | 4,278
Intangible assets, net | 8,015 | 9,012 | 10,466
Goodwill | 2,531 | 3,997 | 4,155
Total Assets | 35,879 | 37,294 | 39,059
Equipment Leasing |  |  |
Segment Reporting Information [Line Items] |  |  |
Fixed assets, net | 19,161 | 39,926 | 69,238
Intangible assets, net | 0 | 0 | 0
Goodwill | 0 | 0 | 0
Total Assets | $ 37,850 | $ 57,544 | $ 95,932

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