XML 64 R52.htm IDEA: XBRL DOCUMENT v3.21.2
Derivatives - Additional Information (Detail) - Cross Currency Swaps [Member] - USD ($)
9 Months Ended
Jun. 30, 2021
Sep. 30, 2020
Derivative [Line Items]    
Fair value of swaps, net assets $ 4,000,000  
Fair value of swaps, net liability   $ 1,000,000
Net Investment Hedge [Member]    
Derivative [Line Items]    
Notional Amount 250,000,000  
Cumulative gain (loss) related to swaps $ 7,000,000 $ 2,000,000
Net Investment Hedge [Member] | Fixed Rate Debt [Member]    
Derivative [Line Items]    
Derivative Instruments Frequency of Cash Settlements semi-annually