Commitments and Contingencies - Lease Maturity Schedule (Details) - USD ($) $ in Thousands	Oct. 31, 2019	Apr. 30, 2019
Finance leases
2020	$ 3,115
2021	3,119
2022	3,116
2023	3,118
2024	1,697
Thereafter	9,277
Total minimum lease payments	23,442
Less amount representing interest	6,142
Present value of net minimum lease payments	17,300
Operating leases
2020	1,872
2021	1,821
2022	1,734
2023	1,669
2024	1,556
Thereafter	25,301
Total minimum lease payments	33,953
Less amount representing interest	13,106
Present value of net minimum lease payments	$ 20,847
Capital leases
2020		$ 3,103
2021		3,109
2022		3,096
2023		3,098
2024		2,548
Thereafter		9,215
Total minimum lease payments		24,169
Less amount representing interest		7,689
Present value of net minimum lease payments		16,480
Operating leases
2020		1,703
2021		1,547
2022		1,354
2023		1,228
2024		1,066
Thereafter		10,438
Total minimum lease payments		$ 17,336