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Derivative Instruments - Offsetting Assets (Detail) - USD ($) $ in Thousands	Oct. 31, 2018	Jan. 31, 2018
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	$ 36,416	$ 98
Gross Amounts Offset on the Condensed Consolidated Balance Sheets	0
Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheets	36,416
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Financial Instruments	(540)
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Cash Collateral Received	0
Net Assets Exposed	35,876
Counterparty A
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	8,172
Gross Amounts Offset on the Condensed Consolidated Balance Sheets	0
Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheets	8,172
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Financial Instruments	(91)
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Cash Collateral Received	0
Net Assets Exposed	8,081
Counterparty B
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	23,879
Gross Amounts Offset on the Condensed Consolidated Balance Sheets	0
Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheets	23,879
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Financial Instruments	(337)
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Cash Collateral Received	0
Net Assets Exposed	23,542
Counterparty C
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	4,365
Gross Amounts Offset on the Condensed Consolidated Balance Sheets	0
Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheets	4,365
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Financial Instruments	(112)
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Cash Collateral Received	0
Net Assets Exposed	$ 4,253

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