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Debt (Details) - USD ($)
1 Months Ended 12 Months Ended
Sep. 17, 2021
Jul. 31, 2021
Apr. 30, 2023
Apr. 30, 2022
Apr. 30, 2021
Debt Disclosure [Abstract]          
Proceeds from Issuance of Senior Long-term Debt   $ 575,000,000 $ 0 $ 575,000,000 $ 0
Debt Instrument, Interest Rate, Stated Percentage   4.125%      
Long-term debt, net     567,543,000 566,520,000  
Long-term Debt, Gross     575,000,000 575,000,000  
Debt Issuance Costs, Net     (7,457,000) (8,480,000)  
Interest Expense, Debt, Excluding Amortization     23,719,000 19,370,000  
Amortization of debt issuance costs     1,023,000 803,000 0
Interest Expense, Debt     24,742,000 20,173,000  
Debt Instrument [Line Items]          
Proceeds from Issuance of Senior Long-term Debt   $ 575,000,000 0 575,000,000 0
Debt Instrument, Interest Rate, Stated Percentage   4.125%      
Long-term debt, net     567,543,000 566,520,000  
Long-term Debt, Gross     575,000,000 575,000,000  
Debt Issuance Costs, Net     7,457,000 8,480,000  
Interest Expense, Debt, Excluding Amortization     23,719,000 19,370,000  
Amortization of debt issuance costs     1,023,000 803,000 $ 0
Interest Expense, Debt     $ 24,742,000 $ 20,173,000  
Senior Notes          
Debt Disclosure [Abstract]          
Proceeds from Issuance of Senior Long-term Debt   $ 575,000,000      
Debt Instrument, Interest Rate, Stated Percentage   4.125%      
Long-term debt, net   $ 565,700,000      
underwriting commissions   7,200,000      
Other issuance cost   2,100,000      
Debt Issuance Costs, Gross   9,300,000      
Debt Instrument [Line Items]          
Proceeds from Issuance of Senior Long-term Debt   $ 575,000,000      
Debt Instrument, Interest Rate, Stated Percentage   4.125%      
Long-term debt, net   $ 565,700,000      
underwriting commissions   7,200,000      
Other issuance cost   2,100,000      
Debt Issuance Costs, Gross   $ 9,300,000      
Repurchase of debt (as a percent)   101.00%      
Debt Instrument, Redemption, Period One | Senior Notes          
Debt Instrument [Line Items]          
Redemption price (as a percent)   100.00%      
Redemption price of principal (as a percent)   40.00%      
Debt Instrument, Redemption, Period Two | Senior Notes          
Debt Instrument [Line Items]          
Redemption price (as a percent)   104.125%      
Debt Instrument, Redemption, Period Three | Senior Notes          
Debt Instrument [Line Items]          
Redemption price (as a percent)   100.00%      
cmdWatch Security Inc.          
Debt Instrument [Line Items]          
Business Combination, Consideration Transferred for Outstanding Options $ 4,300,000