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Derivative Instruments - Offsetting Assets (Detail) - USD ($) $ in Thousands	Apr. 30, 2019	Jan. 31, 2019
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	$ 35,238	$ 22,570
Gross Amounts Offset on the Condensed Consolidated Balance Sheets	0
Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheets	35,238
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Financial Instruments	(752)
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Cash Collateral Received	0
Net Assets Exposed	34,486
Counterparty A
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	2,603
Gross Amounts Offset on the Condensed Consolidated Balance Sheets	0
Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheets	2,603
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Financial Instruments	(272)
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Cash Collateral Received	0
Net Assets Exposed	2,331
Counterparty B
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	30,084
Gross Amounts Offset on the Condensed Consolidated Balance Sheets	0
Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheets	30,084
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Financial Instruments	(448)
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Cash Collateral Received	0
Net Assets Exposed	29,636
Counterparty C
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	2,551
Gross Amounts Offset on the Condensed Consolidated Balance Sheets	0
Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheets	2,551
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Financial Instruments	(32)
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Cash Collateral Received	0
Net Assets Exposed	$ 2,519

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