Indebtedness - Narrative (Details)					1 Months Ended	12 Months Ended
	Oct. 02, 2024 USD ($)	Jun. 30, 2022 USD ($) prepaymentPeriod	Apr. 27, 2022 USD ($)	Apr. 30, 2019 USD ($)	Jun. 30, 1997 USD ($) instrument	Oct. 31, 2025 USD ($)	Oct. 31, 2024 USD ($)	Oct. 31, 2023 USD ($)	Oct. 05, 2026 USD ($)	Sep. 30, 2025 USD ($)	Apr. 26, 2007 USD ($)
Debt Instrument [Line Items]
Total long-term debt						$ 921,500,000	$ 921,800,000
Line of Credit
Debt Instrument [Line Items]
Debt instrument, term						5 years
Maximum borrowing capacity under credit facility						$ 900,000,000
Debentures
Debt Instrument [Line Items]
Interest expense, debt						8,000,000.0	8,000,000.0	$ 8,000,000.0
Aggregate principal amount of notes issued					$ 175,000,000.0
Interest rate percentage					7.80%
Amount paid to terminate forward-starting interest rate swap agreements					$ 23,700,000
Number of terminated forward-starting interest rate swap agreements | instrument					3
Derivative, notional amount					$ 125,000,000.0
Deferred income amount at the time of swap termination					$ 18,700,000
Term loan, due October 2029 | Senior Notes
Debt Instrument [Line Items]
Debt instrument, term	5 years
Total long-term debt						200,000,000.0
Interest expense, debt						11,100,000	17,000,000.0	15,900,000
Aggregate principal amount of notes issued	$ 200,000,000.0
Accordion feature, increase limit	$ 100,000,000.0
Line of credit facility, periodic payment, principal						$ 5,000,000
Debt, weighted average interest rate						5.19%
$200 million term loan, due April 2027 | Senior Notes
Debt Instrument [Line Items]
Debt instrument, term			5 years
Aggregate principal amount of notes issued			$ 200,000,000.0
Carrying amount of long-term debt						$ 0	200,000,000.0
Term loan, due April 2027 | Senior Notes
Debt Instrument [Line Items]
Carrying amount of long-term debt						$ 0
3.81% series A senior notes, due June 2029 | Senior Notes
Debt Instrument [Line Items]
Aggregate principal amount of notes issued				$ 100,000,000.0
Interest rate percentage				3.81%		3.81%
Carrying amount of long-term debt						$ 100,000,000.0	100,000,000.0
3.91% series B senior notes, due June 2031 | Senior Notes
Debt Instrument [Line Items]
Aggregate principal amount of notes issued				$ 100,000,000.0
Interest rate percentage				3.91%		3.91%
Carrying amount of long-term debt						$ 100,000,000.0	100,000,000.0
Series A and Series B Senior Notes | Senior Notes
Debt Instrument [Line Items]
Interest expense, debt						7,700,000	7,700,000	7,700,000
Debt instrument, redemption price, percentage				100.00%
Debt instrument, repayment period | prepaymentPeriod		90
Series A and Series B Senior Notes | Senior Notes | Debt Instrument, Redemption, Period One
Debt Instrument [Line Items]
Debt instrument, redemption price, percentage				10.00%
Series A and Series B Senior Notes | Senior Notes | Debt Instrument, Redemption, Period Two
Debt Instrument [Line Items]
Debt instrument, redemption price, percentage				100.00%
Series A and Series B Senior Notes | Senior Notes | Debt Instrument, Redemption, Period Three
Debt Instrument [Line Items]
Debt instrument, redemption price, percentage				100.00%
3.97% senior notes, due June 2032 | Senior Notes
Debt Instrument [Line Items]
Interest expense, debt						$ 4,000,000.0
Aggregate principal amount of notes issued		$ 100,000,000.0
Interest rate percentage		3.97%				3.97%
Carrying amount of long-term debt						$ 100,000,000.0	100,000,000.0
Debt instrument, redemption price, percentage		10.00%
Debt instrument, repayment period | prepaymentPeriod		90
Debt instrument, prepaid principal, percentage		100.00%
5.27% senior notes, due September 2032 | Senior Notes
Debt Instrument [Line Items]
Interest expense, debt						$ 900,000
Aggregate principal amount of notes issued										$ 200,000,000.0
Interest rate percentage						5.27%				5.27%
Carrying amount of long-term debt						$ 200,000,000.0	0
Debt instrument, redemption price, percentage		10.00%
Debt instrument, repayment period | prepaymentPeriod		90
Debt instrument, prepaid principal, percentage		100.00%
Coupon 7.125% Debt Notes | Debentures
Debt Instrument [Line Items]
Debt instrument, term					10 years
Aggregate principal amount of notes issued					$ 75,000,000.0
Interest rate percentage					7.125%
7.8% debentures, due June 2027 | Debentures
Debt Instrument [Line Items]
Debt instrument, term					30 years
Total long-term debt					$ 100,000,000.0
Interest rate percentage					7.80%	7.80%
Carrying amount of long-term debt						$ 100,000,000.0	100,000,000.0
6.625% Senior Notes
Debt Instrument [Line Items]
Interest expense, debt						$ 8,400,000	8,400,000	8,400,000
Debt instrument, basis spread on variable rate						0.30%
6.625% Senior Notes | Senior Notes
Debt Instrument [Line Items]
Aggregate principal amount of notes issued											$ 125,000,000.0
Interest rate percentage						6.625%					6.625%
Percentage of par value at which debt was issued											98.513%
Debt discount, unamortized											$ 1,900,000
Effective interest rate						6.741%
Redemption price as a percentage of the principal amount upon the occurrence of both a change of control and downgrade of rating						101.00%
Revolving credit facility, due October 2029 | Line of Credit
Debt Instrument [Line Items]
Carrying amount of long-term debt						$ 0	0
Revolving credit facility, due October 2029 | Unsecured Revolving Credit Facility | Line of Credit
Debt Instrument [Line Items]
Debt instrument, term	5 years
Maximum borrowing capacity under credit facility	$ 900,000,000.0
Accordion feature	450,000,000.0
Total long-term debt						0
Unused borrowing capacity						$ 897,900,000	897,300,000
Interest rate on outstanding borrowings						5.24%
Interest expense, debt						$ 9,400,000	5,400,000	$ 5,700,000
Revolving credit facility, due October 2029 | Unsecured Revolving Credit Facility | Forecast | Line of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity under credit facility									$ 600,000,000
Standby Letters of Credit | Unsecured Revolving Credit Facility | Line of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity under credit facility	10,000,000.0
Total long-term debt						$ 2,100,000	$ 2,700,000
Swingline Loan | Unsecured Revolving Credit Facility | Line of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity under credit facility	$ 75,000,000.0