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Credit Facility - Additional Information (Detail)
¥ in Millions
1 Months Ended 6 Months Ended
Nov. 28, 2016
USD ($)
Jul. 31, 2018
Apr. 30, 2019
USD ($)
Apr. 30, 2018
USD ($)
Apr. 30, 2019
CNY (¥)
Oct. 31, 2018
USD ($)
May 19, 2015
USD ($)
Debt Instrument [Line Items]              
Long-term debt     $ 126,152,000     $ 125,535,000  
Proceeds from credit facilities     188,760,000 $ 450,000,000      
Foreign Line of Credit              
Debt Instrument [Line Items]              
Credit facility maximum borrowing capacity     33,000,000.0   ¥ 220.0    
Noncurrent portion of line of credit     14,600,000        
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     $ 150,000,000.0     330,000,000.0  
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     $ 127,300,000     133,800,000  
Long-term debt     $ 111,600,000     $ 120,000,000.0  
Unsecured Debt | The Credit Agreement | Term Loan | London Interbank Offered Rate (LIBOR)              
Debt Instrument [Line Items]              
Borrowings, interest rate     1.125%