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Indebtedness - Summary of Long Term Debt (Details) - USD ($)	Oct. 31, 2019	Apr. 30, 2019	Oct. 31, 2018	Jun. 30, 1997
Debt Instrument [Line Items]
Less: unamortized discounts, debt issuance costs, and deferred charges	$ (3,103,000)		$ (2,305,000)
Total long-term debt	700,813,000		312,549,000
Less: current portion of long-term debt	79,914,000		0
Long-term debt, less current portion	620,899,000		312,549,000
Line of Credit
Debt Instrument [Line Items]
Carrying amount of long-term debt	$ 100,000,000		100,000,000
Interest rate percentage	7.80%
6.625% senior notes
Debt Instrument [Line Items]
Carrying amount of long-term debt			123,854,000
Total long-term debt				$ 100,000,000.0
Interest rate percentage	6.625%			7.80%
Senior Notes \| $200 million term loan
Debt Instrument [Line Items]
Carrying amount of long-term debt	$ 100,000,000
Senior Notes \| $300 million term loan
Debt Instrument [Line Items]
Carrying amount of long-term debt	180,000,000
Senior Notes \| 3.81% series A senior notes
Debt Instrument [Line Items]
Carrying amount of long-term debt	$ 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
Interest rate percentage	3.91%	3.91%
Senior Notes \| 6.625% senior notes
Debt Instrument [Line Items]
Carrying amount of long-term debt	$ 123,916,000
Line of Credit
Debt Instrument [Line Items]
Carrying amount of long-term debt	$ 0		$ 91,000,000