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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