Annual report pursuant to Section 13 and 15(d)

Quarterly Results of Operations-Unaudited - Quarterly Results of Operations (Parenthetical) (Detail)

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Quarterly Results of Operations-Unaudited - Quarterly Results of Operations (Parenthetical) (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Jan. 31, 2016
Jan. 31, 2016
Quarterly Financial Information Disclosure [Abstract]    
Loss on impairment of TLL, LLC net assets $ 21,500 $ 21,464