Leases - Future Minimum Lease Payments (Details) $ in Thousands	Apr. 30, 2019 USD ($)
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2020	$ 17,943
2021	17,649
2022	12,435
2023	10,636
2024	9,854
Thereafter	38,871
Total, Operating	107,388
Capital Leases, Future Minimum Payments, Present Value of Net Minimum Payments, Fiscal Year Maturity [Abstract]
2020	2,456
2021	1,953
2022	1,013
2023	705
2024	701
Thereafter	166
Total, Capital	6,994
Less amounts representing interest (2% - 6.5%)	(349)
Total obligations under capital leases	$ 6,645
Minimum [Member]
Operating Leased Assets [Line Items]
Capital leases, interest rate, effective percentage	2.00%
Maximum [Member]
Operating Leased Assets [Line Items]
Capital leases, interest rate, effective percentage	6.50%