Quarterly report pursuant to Section 13 or 15(d)

Accumulated Other Comprehensive Income - Reclassifications out of AOCI (Details)

v3.22.2
Accumulated Other Comprehensive Income - Reclassifications out of AOCI (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Jun. 30, 2022
Jun. 30, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                
Prior service credit $ (300,854)     $ (291,122)     $ (928,255) $ (828,424)
Other income (deductions), net (448)     (2,442)     (31,599) (6,760)
Income (loss) before income taxes 3,915     1,041     (21,182) 9,153
Income taxes (1,040)     2,325     2,311 (2,627)
Net income (loss) 2,875 $ (1,936) $ (19,810) 3,366 $ 5,152 $ (1,992) (18,871) 6,526
Post-retirement benefit plans                
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                
Income taxes (17)     761        
Net income (loss) 52     (2,358)     (23,313) (6,737)
Post-retirement benefit plans | Reclassification out of Accumulated Other Comprehensive Income                
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                
Income (loss) before income taxes 69     (3,119)     (30,878) (8,923)
Income taxes             7,565 2,186
Prior service credit | Reclassification out of Accumulated Other Comprehensive Income                
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                
Prior service credit 157     137     358 377
Actuarial losses | Reclassification out of Accumulated Other Comprehensive Income                
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                
Other income (deductions), net (88)     (2,730)     (380) (8,774)
Settlement loss | Reclassification out of Accumulated Other Comprehensive Income                
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                
Other income (deductions), net 0           (30,856)  
Prior service cost write-off | Reclassification out of Accumulated Other Comprehensive Income                
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                
Other income (deductions), net       (526)       (526)
Derivatives | Reclassification out of Accumulated Other Comprehensive Income                
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                
Income (loss) before income taxes (470)     (790)     (2,006) (2,444)
Income taxes 117     194     493 599
Net income (loss) (353)     (596)     (1,513) (1,845)
Derivatives | Interest rate swap contracts | Reclassification out of Accumulated Other Comprehensive Income                
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                
Interest expense $ (470)     $ (790)     $ (2,006) $ (2,444)