Segment Information - Net Income Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Apr. 30, 2020	Apr. 30, 2019	Apr. 30, 2020	Apr. 30, 2019
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Segment profit	$ 40,780	$ 45,991	$ 134,490	$ 135,612
Unallocated amounts:
Administrative costs	(4,290)	(6,370)	(15,865)	(19,339)
Asset Impairment Charges	(13,821)	0	(13,821)	0
Investment and other income	112	2,065	3,252	3,425
Interest expense	(628)	(708)	(1,976)	(2,137)
Income before income taxes	22,153	40,978	106,080	117,561
Asset Impairment Charges	13,821	0	13,821	0
Workplace Safety
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Segment profit	4,379	6,099	14,991	16,301
Unallocated amounts:
Asset Impairment Charges	(11,029)
Asset Impairment Charges	11,029
ID Solutions
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Segment profit	36,401	$ 39,892	$ 119,499	$ 119,311
Unallocated amounts:
Asset Impairment Charges	(2,792)
Asset Impairment Charges	$ 2,792

Administrative costs.

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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Amount of the cost of borrowed funds accounted for as interest expense.

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