Deferred Compensation and Retirement Plans (Tables)

3 Months Ended

Jul. 31, 2018

Compensation And Retirement Disclosure [Abstract]

Components of Net Periodic Benefits Costs

The components of net periodic benefit costs are as follows:

	Three Months Ended July 31,
	2018			2017
	(in thousands)
Service cost	$	3,646		$	2,065
Interest cost		1,296			1,020
Amortization of actuarial loss		446			577
Expected return on plan assets (1)		(392	)		(399	)
Net periodic service credit amortization		(77	)		—
Net periodic benefit costs (2)	$	4,919		$	3,263

(1) The expected long-term rate of return on plan assets is 6.25% and 6.50% for July 31, 2018 and 2017, respectively.

(2) The service cost, interest cost and the other components of net periodic benefit costs are included in compensation and benefits expense, interest expense, net and other income, net, respectively, on the consolidated statements of operations.