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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