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Credit and Term Loan Facilities - Additional Information (Detail)
1 Months Ended 3 Months Ended
Nov. 28, 2016
USD ($)
Jul. 31, 2018
USD ($)
Jan. 31, 2020
USD ($)
Jan. 31, 2019
USD ($)
Oct. 31, 2019
USD ($)
Jul. 31, 2018
CNY (¥)
May 19, 2015
USD ($)
Debt Instrument [Line Items]              
Long-term debt, excluding current maturities     $ 122,516,000   $ 120,093,000 [1]    
Proceeds from credit facilities     196,490,000 $ 185,080,000      
Revolving Credit Facility              
Debt Instrument [Line Items]              
Current portion of line of credit     190,000,000.0        
The Credit Agreement              
Debt Instrument [Line Items]              
Current portion of line of credit     $ 25,000,000.0        
Foreign Line of Credit              
Debt Instrument [Line Items]              
Credit facility maximum borrowing capacity   $ 33,000,000.0       ¥ 220,000,000.0  
Foreign Line of Credit | Chinese Central Bank Rate              
Debt Instrument [Line Items]              
Borrowings, interest rate   10.00%          
Unsecured Debt | The Credit Agreement | Revolving Credit Facility              
Debt Instrument [Line Items]              
Credit facility maximum borrowing capacity $ 650,000,000.0           $ 500,000,000.0
Additional borrowings from credit facility 150,000,000.0            
Current portion of line of credit         0    
Unsecured Debt | The Credit Agreement | Revolving Credit Facility | Minimum              
Debt Instrument [Line Items]              
Commitment fees percentage     0.125%        
Unsecured Debt | The Credit Agreement | Revolving Credit Facility | Maximum              
Debt Instrument [Line Items]              
Commitment fees percentage     0.20%        
Unsecured Debt | The Credit Agreement | Revolving Credit Facility | London Interbank Offered Rate (LIBOR)              
Debt Instrument [Line Items]              
Borrowings, interest rate     1.00%        
Unsecured Debt | The Credit Agreement | Term Loan              
Debt Instrument [Line Items]              
Senior unsecured term loan facility, face amount $ 150,000,000.0            
Long-term debt     $ 116,100,000   119,800,000    
Long-term debt, excluding current maturities     $ 97,500,000   $ 102,200,000    
Unsecured Debt | The Credit Agreement | Term Loan | London Interbank Offered Rate (LIBOR)              
Debt Instrument [Line Items]              
Borrowings, interest rate     1.125%        
[1]
Derived from audited financial statements.