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Debt Facilities - Narrative (Details)
12 Months Ended
Jan. 31, 2020
USD ($)
Jan. 24, 2020
USD ($)
Sep. 30, 2020
USD ($)
extension
Term Loan Facility [Member]      
Debt Instrument [Line Items]      
Aggregate Principal Amount   $ 400,000,000.0  
Debt Issuance Costs   $ 2,200,000 $ 1,700,000
Redemption Percentage   1.25%  
Long-term Debt     $ 390,000,000.0
Interest Rate at Period End     2.365%
Term Loan Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]      
Debt Instrument [Line Items]      
Basis Spread on Variable Rate     1.125%
Term Loan Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum      
Debt Instrument [Line Items]      
Basis Spread on Variable Rate   1.125%  
Term Loan Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum      
Debt Instrument [Line Items]      
Basis Spread on Variable Rate   1.75%  
Term Loan Facility [Member] | Alternate Base Rate [Member]      
Debt Instrument [Line Items]      
Basis Spread on Variable Rate     0.125%
Term Loan Facility [Member] | Alternate Base Rate [Member] | Minimum      
Debt Instrument [Line Items]      
Basis Spread on Variable Rate   0.125%  
Term Loan Facility [Member] | Alternate Base Rate [Member] | Maximum      
Debt Instrument [Line Items]      
Basis Spread on Variable Rate   0.75%  
Revolving Credit Facility [Member]      
Debt Instrument [Line Items]      
Aggregate Principal Amount $ 350,000,000.0    
Conditional Increase In Borrowing Capacity $ 150,000,000.0    
Number Of Extensions | extension     2
Length Of Extension Period     1 year
Long-term Line of Credit     $ 0
Outstanding Line of Credit Balance     $ 350,000,000.0
Revolving Credit Facility [Member] | Minimum      
Debt Instrument [Line Items]      
Commitment Fee Percentage 0.125%    
Revolving Credit Facility [Member] | Maximum      
Debt Instrument [Line Items]      
Commitment Fee Percentage 0.30%    
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum      
Debt Instrument [Line Items]      
Basis Spread on Variable Rate 1.125%    
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum      
Debt Instrument [Line Items]      
Basis Spread on Variable Rate 1.75%    
Revolving Credit Facility [Member] | Alternate Base Rate [Member] | Minimum      
Debt Instrument [Line Items]      
Basis Spread on Variable Rate 0.125%    
Revolving Credit Facility [Member] | Alternate Base Rate [Member] | Maximum      
Debt Instrument [Line Items]      
Basis Spread on Variable Rate 0.75%