Quarterly report pursuant to Section 13 or 15(d)

Pension and Other Postretirement Benefit Plans (Details)

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Pension and Other Postretirement Benefit Plans (Details) - USD ($)
 1 Months Ended 3 Months Ended 6 Months Ended
Apr. 30, 2021
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Subsequent Event          
Amortization:          
Employer contribution $ 15,000,000        
Pension          
Net periodic benefit cost [Abstract]          
Service cost   $ 1,983,000 $ 2,170,000 $ 4,196,000 $ 4,340,000
Interest cost *   1,546,000 1,933,000 3,094,000 3,866,000
Expected return on plan assets *   (2,762,000) (2,232,000) (5,525,000) (4,464,000)
Amortization:          
Prior service cost   (41,000) (47,000) (58,000) (94,000)
Net actuarial loss *   3,023,000 2,386,000 6,044,000 4,773,000
Net benefit cost   3,749,000 4,210,000 7,751,000 8,421,000
Additional contributions expected in fiscal 2021:          
Supplemental retirement plan   15,000,000   15,000,000  
Other Postretirement          
Net periodic benefit cost [Abstract]          
Service cost   50,000 64,000 100,000 128,000
Interest cost *   94,000 140,000 188,000 280,000
Expected return on plan assets *   0 0 0 0
Amortization:          
Prior service cost   (91,000) (23,000) (182,000) (46,000)
Net actuarial loss *   0 0 0 0
Net benefit cost   53,000 $ 181,000 106,000 $ 362,000
Contributions during the six months ended March 31, 2021:          
Other Postretirement       228,000  
Additional contributions expected in fiscal 2021:          
Supplemental retirement plan   603,000   603,000  
Supplemental retirement plan          
Contributions during the six months ended March 31, 2021:          
Pension       408,000  
Additional contributions expected in fiscal 2021:          
Supplemental retirement plan   $ 497,000   $ 497,000