FAIR VALUE MEASUREMENTS - Plan Assets Measured at Fair Value on Recurring Basis Classified by Fair Value Hierarchy (Detail) - USD ($) $ in Thousands	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	$ 27,267	$ 22,860	$ 21,204
Asset Allocations	100.00%	100.00%
Insurance contract
Defined Benefit Plan Disclosure [Line Items]
Asset Allocations	98.00%	98.00%
Other investments
Defined Benefit Plan Disclosure [Line Items]
Asset Allocations	2.00%	2.00%
Fair Value, Measurements, Recurring
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	$ 27,267	$ 22,860
Asset Allocations	100.00%
Fair Value, Measurements, Recurring | Insurance contract
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	$ 26,651	22,339
Asset Allocations	98.00%
Fair Value, Measurements, Recurring | Other investments
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	$ 616	521
Asset Allocations	2.00%
Fair Value, Measurements, Recurring | Level 1
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	$ 0	0
Fair Value, Measurements, Recurring | Level 1 | Insurance contract
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	0	0
Fair Value, Measurements, Recurring | Level 1 | Other investments
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	0	0
Fair Value, Measurements, Recurring | Level 2
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	0	0
Fair Value, Measurements, Recurring | Level 2 | Insurance contract
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	0	0
Fair Value, Measurements, Recurring | Level 2 | Other investments
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	0	0
Fair Value, Measurements, Recurring | Level 3
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	27,267	22,860
Fair Value, Measurements, Recurring | Level 3 | Insurance contract
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	26,651	22,339
Fair Value, Measurements, Recurring | Level 3 | Other investments
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	$ 616	$ 521