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Summary of Contractual Obligations (Detail)
$ in Thousands
Jan. 31, 2017
USD ($)
Long-term Purchase Commitment [Line Items]  
Total $ 19,977
2018 18,219
2019 214
2020 1,453
2021 20
2022 and Thereafter 71
Purchase Commitments [Member]  
Long-term Purchase Commitment [Line Items]  
Total 19,271
2018 17,848
2020 1,352
2022 and Thereafter 71
Operating Lease Obligations [Member]  
Long-term Purchase Commitment [Line Items]  
Total 706
2018 371
2019 214
2020 101
2021 $ 20