Pension and Other Postretirement Benefits (Tables)

6 Months Ended

Jan. 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 January 31,						For the Six Months Ended January 31,
	2018			2017			2018			2017
Service cost	$	438		$	446		$	862		$	913
Interest cost	517			474			1,014			931
Expected return on plan assets	(485		)	(411		)	(971		)	(887		)
Amortization of:
Prior service costs	—			—			1			1
Other actuarial loss	354			485			641			914
Net periodic benefit cost	$	824		$	994		$	1,547		$	1,872
	Postretirement Health Benefits
	(in thousands)
	For the Three Months Ended January 31,						For the Six Months Ended January 31,
	2018			2017			2018			2017
Service cost	$	25		$	33		$	54		$	63
Interest cost	19			21			43			39
Amortization of:
Prior service costs	(1		)	(1		)	(3		)	(3		)
Other actuarial (gain) loss	(5		)	14			—			20
Net periodic benefit cost	$	38		$	67		$	94		$	119

Schedule of Assumptions Used

Assumptions used in the previous calculations were as follows:

	Pension Benefits				Postretirement Health Benefits
	For the Three and Six Months Ended January 31,
	2018		2017		2018		2017
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	%	7.00	%	—		—

The medical cost trend assumption for postretirement health benefits was 7.20%. The graded trend rate is expected to decrease to an ultimate rate of 4.50% in fiscal year 2036.