Quarterly report pursuant to Section 13 or 15(d)

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

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Accumulated Other Comprehensive Income - Reclassifications out of AOCI (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Derivatives    
Interest expense $ 9,240 $ 10,301
Income before income tax (15,703) 3,589
Income taxes 5,397 (605)
Net (loss) income (10,306) 2,984
Prior service credit    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Income before income tax 70 95
Actuarial losses    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Income before income tax (2,387) (1,046)
Post-retirement benefit plans    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Income before income tax (2,317) (951)
Net income (1,727) (729)
Derivatives    
Income taxes (590) (222)
Derivatives    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Net income 275 555
Derivatives | Reclassification out of Accumulated Other Comprehensive Income    
Derivatives    
Income before income tax 364 735
Income taxes (89) (180)
Net (loss) income 275 555
Derivatives | Interest rate swap contracts | Reclassification out of Accumulated Other Comprehensive Income    
Derivatives    
Interest expense $ 364 $ 735