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Segment Reporting - Additional Information (Detail) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2017 | Oct. 31, 2016 | Jul. 31, 2016 | Apr. 30, 2016 | Jan. 31, 2016 | Oct. 31, 2015 | Jul. 31, 2015 | Apr. 30, 2015 | Jan. 31, 2017 | Jan. 31, 2016 | Jan. 31, 2015
Schedule Of Sales Revenue By Business Segment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 12,548,000 | $ 8,057,000 | $ 8,663,000 | $ 11,731,000 | $ 11,442,000 | $ 15,681,000 | $ 7,554,000 | $ 17,142,000 | $ 40,999,000 | $ 51,819,000 | $ 83,146,000
Reduction in capital expenditures and fixed assets |  |  |  |  |  |  |  |  |  | 6,000 | 192,000
Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |
Schedule Of Sales Revenue By Business Segment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 62,000 | $ 196,000 | $ 562,000

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