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Derivative Instruments - Offsetting Liabilities (Detail) - USD ($) $ in Thousands	Apr. 30, 2018	Jan. 31, 2018
Offsetting Liabilities [Line Items]
Gross Amounts of Recognized Liabilities	$ 11,070	$ 32,912
Gross Amounts Offset in the Condensed Consolidated Balance Sheets	0
Net Amounts of Liabilities Presented in the Condensed Consolidated Balance Sheets	11,070
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Financial Instruments	(6,484)
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Cash Collateral Pledged	0
Net Liabilities Exposed	4,586
Counterparty A
Offsetting Liabilities [Line Items]
Gross Amounts of Recognized Liabilities	2,939
Gross Amounts Offset in the Condensed Consolidated Balance Sheets	0
Net Amounts of Liabilities Presented in the Condensed Consolidated Balance Sheets	2,939
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Financial Instruments	(2,222)
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Cash Collateral Pledged	0
Net Liabilities Exposed	717
Counterparty B
Offsetting Liabilities [Line Items]
Gross Amounts of Recognized Liabilities	6,365
Gross Amounts Offset in the Condensed Consolidated Balance Sheets	0
Net Amounts of Liabilities Presented in the Condensed Consolidated Balance Sheets	6,365
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Financial Instruments	(2,958)
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Cash Collateral Pledged	0
Net Liabilities Exposed	3,407
Counterparty C
Offsetting Liabilities [Line Items]
Gross Amounts of Recognized Liabilities	1,766
Gross Amounts Offset in the Condensed Consolidated Balance Sheets	0
Net Amounts of Liabilities Presented in the Condensed Consolidated Balance Sheets	1,766
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Financial Instruments	(1,304)
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Cash Collateral Pledged	0
Net Liabilities Exposed	$ 462

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Amount of right to receive cash collateral under master netting arrangements that have not been offset against derivative liabilities.

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