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Commitments and Contingencies - Assets and Liabilities of Lessee (Details) $ in Thousands	6 Months Ended
	Oct. 31, 2019 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Finance lease right-of-use assets	$ 14,937
Operating lease right-of-use assets	$ 20,582
Weighted-average remaining lease-term - finance lease	10 years 1 month 6 days
Weighted-average remaining lease-term - operating lease	22 years 2 months 12 days
Weighted-average discount rate - finance lease	5.29%
Weighted-average discount rate - operating lease	4.21%
Right-of-use assets obtained in exchange for new finance lease liabilities (in thousands)	$ 831

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Amount of lessee's right to use underlying asset under finance lease.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
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Weighted average discount rate for finance lease calculated at point in time.

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Weighted average remaining lease term for finance lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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