Pension and Other Postretirement Benefits (Tables)

3 Months Ended

Oct. 31, 2017

Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [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,
	2017			2016
Service cost	$	424		$	467
Interest cost	497			457
Expected return on plan assets	(486		)	(476		)
Amortization of:
Prior service costs	1			1
Other actuarial loss	287			429
Net periodic benefit cost	$	723		$	878
	Postretirement Health Benefits
	(in thousands)
	For the Three Months Ended October 31,
	2017			2016
Service cost	$	29		$	30
Interest cost	24			18
Amortization of:
Prior service costs	(2		)	(2		)
Other actuarial loss	5			6
Net periodic benefit cost	$	56		$	52

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,
	2017		2016		2017		2016
Discount rate for net periodic benefit cost	3.75	%	3.36	%	3.26	%	2.71	%
Rate of increase in compensation levels	3.50	%	3.50	%	—		—
Long-term expected rate of return on assets	7.00	%	7.50	%	—		—

The medical cost trend assumption for postretirement health benefits was 7.5%. The graded trend rate is expected to decrease to an ultimate rate of 4.5% in fiscal year 2036.