Leases (Details) $ in Thousands	3 Months Ended	6 Months Ended
	Oct. 31, 2019 USD ($)	Oct. 31, 2019 USD ($)
Leases
Option to extend		true
Finance lease cost:
Amortization of right-of-use assets	$ 6,054	$ 12,113
Interest on lease liabilities	3,367	6,789
Operating lease cost	10,289	20,709
Variable lease cost	3,414	6,613
Total lease cost	$ 23,124	$ 46,224
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