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Segment Reporting - Financial Information by Business Segment (Revenues) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2018 | Oct. 31, 2017 | Jul. 31, 2017 | Apr. 30, 2017 | Jan. 31, 2017 | Oct. 31, 2016 | Jul. 31, 2016 | Apr. 30, 2016 | Jan. 31, 2018 | Jan. 31, 2017 | Jan. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 10,363 | $ 8,644 | $ 10,836 | $ 18,433 | $ 12,548 | $ 8,057 | $ 8,663 | $ 11,731 | $ 48,276 | $ 40,999 | $ 51,819
Interest expense, net |  |  |  |  |  |  |  |  | 47 | (643) | (725)
Operating (loss) income |  |  |  |  |  |  |  |  | (19,708) | (31,290) | (26,760)
Capital expenditures |  |  |  |  |  |  |  |  | 1,317 | 283 | 2,509
Depreciation and amortization expense |  |  |  |  |  |  |  |  | 16,637 | 28,275 | 32,111
Corporate expenses |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 0 | 0 | 0
Interest expense, net |  |  |  |  |  |  |  |  | 0 | 0 | 0
Operating (loss) income |  |  |  |  |  |  |  |  | (3,211) | (3,001) | (3,702)
Capital expenditures |  |  |  |  |  |  |  |  | 0 | 0 | 0
Depreciation and amortization expense |  |  |  |  |  |  |  |  | 0 | 0 | 0
Equipment Leasing | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 20,919 | 15,941 | 26,665
Interest expense, net |  |  |  |  |  |  |  |  | 65 | (465) | (486)
Operating (loss) income |  |  |  |  |  |  |  |  | (13,930) | (27,782) | (23,454)
Capital expenditures |  |  |  |  |  |  |  |  | 1,049 | 20 | 2,283
Depreciation and amortization expense |  |  |  |  |  |  |  |  | 14,652 | 26,221 | 30,370
Marine Technology Products | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 27,572 | 25,100 | 25,350
Interest expense, net |  |  |  |  |  |  |  |  | (18) | (178) | (239)
Operating (loss) income |  |  |  |  |  |  |  |  | (2,572) | (508) | 279
Capital expenditures |  |  |  |  |  |  |  |  | 268 | 263 | 226
Depreciation and amortization expense |  |  |  |  |  |  |  |  | $ 1,991 | $ 2,054 | $ 1,741

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