Reclassifications out of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	12 Months Ended
Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Accumulated balances
Balance at the beginning of the period	$ (918,674)	$ (864,200)	$ (703,300)
Other comprehensive (loss) income before reclassification	2,600	(96,400)	(170,900)
Amounts reclassified from accumulated other comprehensive loss	15,700	41,900	10,000
Balance at the end of the period	(900,377)	(918,674)	(864,200)
Pension Related Adjustments
Accumulated balances
Balance at the beginning of the period	(342,800)	(302,700)	(202,300)
Other comprehensive (loss) income before reclassification	14,600	(72,500)	(107,200)
Amounts reclassified from accumulated other comprehensive loss	12,000	32,400	6,800
Balance at the end of the period	(316,200)	(342,800)	(302,700)
Foreign Currency Translation Adjustments
Accumulated balances
Balance at the beginning of the period	(567,300)	(548,700)	(502,200)
Other comprehensive (loss) income before reclassification	(12,800)	(18,600)	(46,500)
Balance at the end of the period	(580,100)	(567,300)	(548,700)
Loss on Derivative Instruments
Accumulated balances
Balance at the beginning of the period	(8,600)	(12,800)	1,200
Other comprehensive (loss) income before reclassification	800	(5,300)	(17,200)
Amounts reclassified from accumulated other comprehensive loss	3,700	9,500	3,200
Balance at the end of the period	$ (4,100)	$ (8,600)	$ (12,800)

- Definition

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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