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Debt - Additional Information (Detail)
6 Months Ended
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Jun. 30, 2023
USD ($)
testingPeriod
Dec. 31, 2022
USD ($)
Jul. 31, 2022
USD ($)
Jun. 30, 2022
USD ($)
Mar. 24, 2022
USD ($)
Debt Instrument [Line Items]              
Debt, gross     $ 2,135,000,000        
Leverage ratio covenant period     12 months        
2024     $ 237,500,000        
Line of Credit | Term Loans Due 2024              
Debt Instrument [Line Items]              
Debt, gross     200,000,000        
Optional line of credit limit increase     300,000,000        
Line of Credit | Revolving Credit Facility              
Debt Instrument [Line Items]              
Credit facility maximum borrowing capacity     900,000,000        
Debt, gross     115,700,000 $ 320,000,000.0      
Available capacity     $ 784,300,000        
Average interest rate as of June 30, 2023     6.303%        
Line of Credit | Revolving Credit Facility | Pentair, Pentair Finance S.à r.l (“PFSA“)              
Debt Instrument [Line Items]              
Number of testing periods | testingPeriod     4        
Line of Credit | Revolving Credit Facility | Minimum              
Debt Instrument [Line Items]              
Debt covenant, unrestricted cash     $ 5,000,000        
Debt agreement financial covenant, leverage ratio     1.00        
EBITDA ratio for debt     1.00        
Line of Credit | Revolving Credit Facility | Minimum | Pentair, Pentair Finance S.à r.l (“PFSA“)              
Debt Instrument [Line Items]              
Debt agreement financial covenant, leverage ratio     4.25        
Line of Credit | Revolving Credit Facility | Maximum              
Debt Instrument [Line Items]              
Debt covenant, unrestricted cash     $ 250,000,000        
Debt agreement financial covenant, leverage ratio     3.75        
EBITDA ratio for debt     3.00        
Line of Credit | Revolving Credit Facility | Maximum | Pentair, Pentair Finance S.à r.l (“PFSA“)              
Debt Instrument [Line Items]              
Debt agreement financial covenant, leverage ratio     1.00        
Term Loans              
Debt Instrument [Line Items]              
2024     $ 25,000,000        
Term Loans | 5-year Term Loan Facility              
Debt Instrument [Line Items]              
Debt, gross       1,000,000,000   $ 1,000,000,000 $ 600,000,000
Average interest rate as of June 30, 2023     6.461%        
Long-term Debt, Increase to obligation           400,000,000  
Term Loans | 5-year Term Loan Facility | Forecast | Subsequent Event              
Debt Instrument [Line Items]              
Debt Instrument, Periodic Payment $ 12,500,000 $ 6,300,000          
Senior Notes | Senior Notes Five Point Nine Percent Due Twenty Thirty Two              
Debt Instrument [Line Items]              
Debt, gross       $ 400,000,000.0 $ 400,000,000 $ 400,000,000.0  
Average interest rate as of June 30, 2023     5.90%   5.90%    
Other Credit Facilities              
Debt Instrument [Line Items]              
Credit facility maximum borrowing capacity     $ 20,800,000        
Borrowings outstanding     $ 0