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Retirement Benefits (Schedule of Amounts Recognized in Balance Sheet and Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Defined Benefit Pension Plan [Member]      
Amounts recognized in statement of financial position consist of:      
Other non-current assets $ 20,540 $ 838  
Accrued liabilities (1,059) (1,539)  
Other non-current liabilities (60,395) (62,295)  
Net over/(under) funded status at end of year (40,914) (62,996)  
Amounts recognized in accumulated other comprehensive income consist of:      
Unrecognized net prior service cost (benefit) 5,397 6,329  
Unrecognized net (gains) losses 40,111 60,808  
Total amounts recognized 45,508 67,137 $ 25,273
Deferred taxes (16,178) (21,606)  
Amounts recognized in accumulated other comprehensive income 29,330 45,531  
Other Postretirement Benefit Plans [Member]      
Amounts recognized in statement of financial position consist of:      
Accrued liabilities (1,992) (2,048)  
Other non-current liabilities (23,453) (24,623)  
Net over/(under) funded status at end of year (25,445) (26,671)  
Amounts recognized in accumulated other comprehensive income consist of:      
Unrecognized net prior service cost (benefit) 1 4  
Unrecognized net (gains) losses (363) (3)  
Total amounts recognized (362) 1 424
Deferred taxes (324) (414)  
Amounts recognized in accumulated other comprehensive income (686) (413)  
United States [Member] | Defined Benefit Pension Plan [Member]      
Amounts recognized in statement of financial position consist of:      
Other non-current assets 19,064    
Other non-current liabilities (1,586) (5,039)  
Net over/(under) funded status at end of year 17,478 (5,039)  
Amounts recognized in accumulated other comprehensive income consist of:      
Unrecognized net prior service cost (benefit) 4,814 5,750  
Unrecognized net (gains) losses 9,317 28,167  
Total amounts recognized 14,131 33,917 10,744
Deferred taxes (6,721) (11,577)  
Amounts recognized in accumulated other comprehensive income 7,410 22,340  
Foreign Plan | Defined Benefit Pension Plan [Member]      
Amounts recognized in statement of financial position consist of:      
Other non-current assets 1,476 838  
Accrued liabilities (1,059) (1,539)  
Other non-current liabilities (58,809) (57,256)  
Net over/(under) funded status at end of year (58,392) (57,957)  
Amounts recognized in accumulated other comprehensive income consist of:      
Unrecognized net prior service cost (benefit) 583 579  
Unrecognized net (gains) losses 30,794 32,641  
Total amounts recognized 31,377 33,220 $ 14,529
Deferred taxes (9,457) (10,029)  
Amounts recognized in accumulated other comprehensive income $ 21,920 $ 23,191