Pension and Other Postretirement Benefits (Tables)

3 Months Ended

Oct. 31, 2018

Defined Benefit Plan [Abstract]

Schedule of Net Benefit Costs

The components of net periodic pension and postretirement health benefit costs were as follows:

	Pension Benefits
	(in thousands)
	For the Three Months Ended October 31,
	2018			2017
Service cost	$	422		$	424
Interest cost	540			497
Expected return on plan assets	(702		)	(486		)
Amortization of:
Prior service costs	—			1
Other actuarial loss	221			287
Net periodic benefit cost	$	481		$	723
	Postretirement Health Benefits
	(in thousands)
	For the Three Months Ended October 31,
	2018			2017
Service cost	$	27		$	29
Interest cost	25			24
Amortization of:
Prior service costs	(1		)	(2		)
Other actuarial loss	—			5
Net periodic benefit cost	$	51		$	56

Schedule of Assumptions Used

Assumptions used in the previous calculations were as follows:

	Pension Benefits				Postretirement Health Benefits
	For the Three Months Ended October 31,
	2018		2017		2018		2017
Discount rate for net periodic benefit cost	4.04	%	3.75	%	3.81	%	3.26	%
Rate of increase in compensation levels	3.50	%	3.50	%	—		—
Long-term expected rate of return on assets	7.00	%	7.00	%	—		—

The medical cost trend assumption for postretirement health benefits was 7.50%. The graded trend rate is expected to decrease to an ultimate rate of 4.50% in fiscal year 2038.