Leases - Additional Information Related to Leases (Details)	9 Months Ended
	Jan. 31, 2020 USD ($)
Cash Paid For Amounts Included In The Measurement Of Lease Liabilities [Abstract]
Operating cash flows for finance leases	$ 157,000
Operating cash flows for operating leases	16,731,000
Financing cash flows for financing leases	1,883,000
Right-of-use assets obtained in exchange for new finance lease liabilities	1,399
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 29,622
Weighted average remaining lease term (years)
Weighted average remaining lease term - finance leases	3 years 5 months 8 days
Weighted average remaining lease term - operating leases	6 years 4 months 17 days
Weighted average discount rate
Weighted average discount rate - finance leases (as a percent)	3.20%
Weighted average discount rate - operating leases (as a percent)	4.26%