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Retirement Benefits (Schedule of Amounts Recognized in Balance Sheet and Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Defined Benefit Pension Plan [Member]      
Amounts recognized in statement of financial position consist of:      
Other non-current assets $ 34,051 $ 46,099  
Accrued liabilities (976) (1,017)  
Other non-current liabilities (28,936) (53,339)  
Net over/(under) funded status at end of year 4,139 (8,257)  
Amounts recognized in accumulated other comprehensive income consist of:      
Unrecognized net prior service cost (benefit) 3,937 5,039  
Unrecognized net losses (gains) 9,363 14,044  
Total amounts recognized 13,300 19,083 $ 45,508
Deferred taxes (8,498) (9,476)  
Amounts recognized in accumulated other comprehensive income 4,802 9,607  
Other Postretirement Benefit Plans [Member]      
Amounts recognized in statement of financial position consist of:      
Accrued liabilities (1,803) (1,808)  
Other non-current liabilities (14,994) (19,736)  
Net over/(under) funded status at end of year (16,797) (21,544)  
Amounts recognized in accumulated other comprehensive income consist of:      
Unrecognized net losses (gains) (6,225) (2,815)  
Total amounts recognized (6,225) (2,815) (362)
Deferred taxes 1,247 289  
Amounts recognized in accumulated other comprehensive income (4,978) (2,526)  
United States [Member] | Defined Benefit Pension Plan [Member]      
Amounts recognized in statement of financial position consist of:      
Other non-current assets 24,159 43,917  
Other non-current liabilities (2,122)    
Net over/(under) funded status at end of year 22,037 43,917  
Amounts recognized in accumulated other comprehensive income consist of:      
Unrecognized net prior service cost (benefit) 3,475 4,455  
Unrecognized net losses (gains) 14,822 (10,816)  
Total amounts recognized 18,297 (6,361) 14,131
Deferred taxes (7,801) (1,691)  
Amounts recognized in accumulated other comprehensive income 10,496 (8,052)  
Foreign Plan | Defined Benefit Pension Plan [Member]      
Amounts recognized in statement of financial position consist of:      
Other non-current assets 9,892 2,182  
Accrued liabilities (976) (1,017)  
Other non-current liabilities (26,814) (53,339)  
Net over/(under) funded status at end of year (17,898) (52,174)  
Amounts recognized in accumulated other comprehensive income consist of:      
Unrecognized net prior service cost (benefit) 462 584  
Unrecognized net losses (gains) (5,459) 24,860  
Total amounts recognized (4,997) 25,444 $ 31,377
Deferred taxes (697) (7,785)  
Amounts recognized in accumulated other comprehensive income $ (5,694) $ 17,659