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Indebtedness - Summary of Long Term Debt (Details) - USD ($)			1 Months Ended
	Oct. 05, 2021	Mar. 30, 2020	Mar. 31, 2019	Jun. 30, 1997	Oct. 31, 2021	Oct. 31, 2020	Jun. 27, 2019	Apr. 30, 2019
Debt Instrument [Line Items]
Less: unamortized discounts, debt issuance costs, and deferred charges					$ 2,798,000	$ 2,855,000
Total long-term debt					691,242,000	791,123,000
Less: current portion of long-term debt					0	99,873,000
Long-term debt, less current portion					691,242,000	691,250,000
Line of Credit
Debt Instrument [Line Items]
Carrying amount of long-term debt					0	0
Debt instrument, term	5 years
Senior Notes \| $270 million term loan
Debt Instrument [Line Items]
Carrying amount of long-term debt					270,000,000	0
Total long-term debt					270,000,000
Aggregate principal amount of notes issued	$ 270,000,000				270,000,000
Debt instrument, term	5 years
Senior Notes \| $200 million term loan
Debt Instrument [Line Items]
Carrying amount of long-term debt					0	100,000,000
Aggregate principal amount of notes issued			$ 200,000,000		200,000,000
Debt instrument, term			3 years
Senior Notes \| $300 million term loan
Debt Instrument [Line Items]
Carrying amount of long-term debt					0	180,000,000
Aggregate principal amount of notes issued			$ 300,000,000		300,000,000
Debt instrument, term			5 years
Senior Notes \| $190 million term loan
Debt Instrument [Line Items]
Carrying amount of long-term debt					0	90,000,000
Aggregate principal amount of notes issued		$ 190,000,000.0			$ 190,000,000
Interest rate percentage					0.75%
Debt instrument, term		3 years
Senior Notes \| 3.81% series A senior notes
Debt Instrument [Line Items]
Carrying amount of long-term debt					$ 100,000,000	100,000,000
Aggregate principal amount of notes issued							$ 100,000,000	$ 100,000,000
Interest rate percentage					3.81%			3.81%
Senior Notes \| 3.91% series B senior notes
Debt Instrument [Line Items]
Carrying amount of long-term debt					$ 100,000,000	100,000,000
Aggregate principal amount of notes issued							$ 100,000,000	$ 100,000,000
Interest rate percentage					3.91%			3.91%
Senior Notes \| 6.625% senior notes
Debt Instrument [Line Items]
Carrying amount of long-term debt					$ 124,040,000	123,978,000
Interest rate percentage					6.625%
Debentures
Debt Instrument [Line Items]
Aggregate principal amount of notes issued				$ 175,000,000
Interest rate percentage				7.80%
Debentures \| 7.8% debentures
Debt Instrument [Line Items]
Carrying amount of long-term debt					$ 100,000,000	$ 100,000,000
Total long-term debt				$ 100,000,000
Interest rate percentage				7.80%	7.80%
Debt instrument, term				30 years