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Derivative Instruments - Offsetting Assets (Detail) - USD ($)
$ in Thousands
Apr. 30, 2018
Jan. 31, 2018
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets $ 6,484 $ 98
Gross Amounts Offset on the Condensed Consolidated Balance Sheets 0  
Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheets 6,484  
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Financial Instruments (6,484)  
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Cash Collateral Received 0  
Net Assets Exposed 0  
Counterparty A    
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets 2,222  
Gross Amounts Offset on the Condensed Consolidated Balance Sheets 0  
Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheets 2,222  
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Financial Instruments (2,222)  
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Cash Collateral Received 0  
Net Assets Exposed 0  
Counterparty B    
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets 2,958  
Gross Amounts Offset on the Condensed Consolidated Balance Sheets 0  
Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheets 2,958  
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Financial Instruments (2,958)  
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Cash Collateral Received 0  
Net Assets Exposed 0  
Counterparty C    
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets 1,304  
Gross Amounts Offset on the Condensed Consolidated Balance Sheets 0  
Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheets 1,304  
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Financial Instruments (1,304)  
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Cash Collateral Received 0  
Net Assets Exposed $ 0