Leases (Details) $ in Thousands	3 Months Ended	9 Months Ended
	Jan. 31, 2020 USD ($)	Jan. 31, 2020 USD ($)
Leases
Option to extend		true
Finance lease cost:
Amortization of right-of-use assets	$ 6,007	$ 18,120
Interest on lease liabilities	3,300	10,089
Operating lease cost	10,646	31,555
Variable lease cost	3,311	9,924
Total lease cost	$ 23,264	$ 69,688
Minimum
Leases
Lease term (in years)	1 year	1 year
Renewal lease term (in years)	1 year	1 year
Maximum
Leases
Lease term (in years)	11 years	11 years
Renewal lease term (in years)	5 years	5 years