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Concentration of Risk - Additional Information (Detail) - Vendor [Member]	12 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2017
Purchases [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	21.60%	31.30%	33.20%
Trade Accounts Payables [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	28.70%	26.60%	42.70%

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

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