Leases (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Apr. 30, 2020	Apr. 30, 2020	Aug. 01, 2019	Jul. 31, 2019
Operating Lease Expense [Line Items]
Operating Lease, Weighted Average Remaining Lease Term	3 years 8 months 12 days	3 years 8 months 12 days
Operating Lease, Weighted Average Discount Rate, Percent	3.40%	3.40%
Operating Lease, Payments		$ 12,469
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability		10,637
Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months	$ 4,245	4,245		$ 18,450
Lessee, Operating Lease, Liability, Payments, Due Year Two	15,429	15,429		16,132
Lessee, Operating Lease, Liability, Payments, Due Year Three	12,554	12,554		13,439
Lessee, Operating Lease, Liability, Payments, Due Year Four	9,209	9,209		10,065
Lessee, Operating Lease, Liability, Payments, Due Year Five	5,470	5,470		5,656
Lessee, Operating Lease, Liability, Payments, Due after Year Five	3,160	3,160		3,502
Lessee, Operating Lease, Liability, Payments, Due	50,067	50,067		$ 67,244
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	(3,338)	(3,338)
Operating Lease, Liability	46,729	46,729	$ 58,544
Operating Lease, Impairment Loss	2,475
Workplace Safety
Operating Lease Expense [Line Items]
Operating Lease, Impairment Loss	2,035
ID Solutions
Operating Lease Expense [Line Items]
Operating Lease, Impairment Loss	440
Cost of Sales [Member]
Operating Lease Expense [Line Items]
Operating Lease, Cost	2,074	7,036
Selling, General and Administrative Expenses [Member]
Operating Lease Expense [Line Items]
Operating Lease, Cost	$ 2,145	$ 6,861