Annual report pursuant to Section 13 and 15(d)

Consolidated Balance Sheet Detail - Other Accrued Expenses (Parenthetical) (Detail)

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Consolidated Balance Sheet Detail - Other Accrued Expenses (Parenthetical) (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Jan. 31, 2017
Jan. 31, 2017
Jan. 31, 2016
Balance Sheet Related Disclosures [Abstract]      
Provision for loss contract $ 4,100 $ (4,118) $ 9,162