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Derivative Instruments - Offsetting Assets (Detail) - USD ($) $ in Thousands	Jul. 31, 2019	Jan. 31, 2019
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	$ 53,135	$ 22,570
Gross Amounts Offset on the Condensed Consolidated Balance Sheets	0
Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheets	53,135
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Financial Instruments	(518)
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Cash Collateral Received	0
Net Assets Exposed	52,617
Counterparty A
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	4,101
Gross Amounts Offset on the Condensed Consolidated Balance Sheets	0
Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheets	4,101
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Financial Instruments	0
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Cash Collateral Received	0
Net Assets Exposed	4,101
Counterparty B
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	44,336
Gross Amounts Offset on the Condensed Consolidated Balance Sheets	0
Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheets	44,336
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Financial Instruments	(102)
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Cash Collateral Received	0
Net Assets Exposed	44,234
Counterparty C
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	4,698
Gross Amounts Offset on the Condensed Consolidated Balance Sheets	0
Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheets	4,698
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Financial Instruments	(416)
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Cash Collateral Received	0
Net Assets Exposed	$ 4,282

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