COMMITMENTS AND CONTINGENCIES - Additional Information (Detail) - USD ($) $ in Millions	Apr. 30, 2017	Jan. 31, 2017
Long-term Purchase Commitment [Line Items]
Total purchase obligation		$ 46.2
Purchase obligation, due in 2017		10.0
Purchase obligation, due in 2018		22.1
Purchase obligation, due in 2019		$ 14.1
Tyler, Texas
Long-term Purchase Commitment [Line Items]
Estimated cost of investment	$ 200.5

Estimated total cost of investment.

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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.

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Minimum amount of purchase arrangement in which the entity has agreed to expend funds to procure goods or services from a supplier.

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No definition available.

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- Definition

Minimum amount of purchase arrangement maturing in the second fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments.

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Minimum amount of purchase arrangement maturing in the third fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments.

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Minimum amount of purchase arrangement maturing in the remainder of the fiscal year following the latest fiscal year ended. Includes, but is not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments.

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No definition available.

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