Operating Leases, Total Net Lease Costs (Details) - USD ($) $ in Thousands		12 Months Ended
		Apr. 30, 2021	Apr. 30, 2020
Net Lease Costs [Abstract]
Operating lease cost		$ 24,862	$ 26,027
Variable lease cost		2,135	3,856
Short-term lease cost		248	86
Sublease income		(722)	(691)
Total net lease cost	[1]	$ 26,523	$ 29,278

[1] Total net lease cost does not include those costs included in Restructuring and related charges on our Consolidated Statements of Income (Loss). See Note 7, “Restructuring and Related Charges” for more information on these programs.