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Derivative Instruments (Offsetting Liabilities) (Detail) - USD ($) $ in Thousands	Jan. 31, 2019	Jan. 31, 2018
Offsetting Liabilities [Line Items]
Gross Amounts of Recognized Liabilities	$ 3,135	$ 32,912
Gross Amounts Offset on the Consolidated Balance Sheets	0
Net Amounts of Liabilities Presented on the Consolidated Balance Sheets	3,135
Gross Amounts Not Offset in the Consolidated Balance Sheets, Financial Instruments	(3,135)
Gross Amounts Not Offset in the Consolidated Balance Sheets, Cash Collateral Pledged	0
Net Liabilities Exposed	0
Counterparty A
Offsetting Liabilities [Line Items]
Gross Amounts of Recognized Liabilities	78
Gross Amounts Offset on the Consolidated Balance Sheets	0
Net Amounts of Liabilities Presented on the Consolidated Balance Sheets	78
Gross Amounts Not Offset in the Consolidated Balance Sheets, Financial Instruments	(78)
Gross Amounts Not Offset in the Consolidated Balance Sheets, Cash Collateral Pledged	0
Net Liabilities Exposed	0
Counterparty B
Offsetting Liabilities [Line Items]
Gross Amounts of Recognized Liabilities	1,823
Gross Amounts Offset on the Consolidated Balance Sheets	0
Net Amounts of Liabilities Presented on the Consolidated Balance Sheets	1,823
Gross Amounts Not Offset in the Consolidated Balance Sheets, Financial Instruments	(1,823)
Gross Amounts Not Offset in the Consolidated Balance Sheets, Cash Collateral Pledged	0
Net Liabilities Exposed	0
Counterparty C
Offsetting Liabilities [Line Items]
Gross Amounts of Recognized Liabilities	1,234
Gross Amounts Offset on the Consolidated Balance Sheets	0
Net Amounts of Liabilities Presented on the Consolidated Balance Sheets	1,234
Gross Amounts Not Offset in the Consolidated Balance Sheets, Financial Instruments	(1,234)
Gross Amounts Not Offset in the Consolidated Balance Sheets, Cash Collateral Pledged	0
Net Liabilities Exposed	$ 0

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