Goodwill Rollforward (Detail) $ in Thousands	3 Months Ended
	Oct. 31, 2017 USD ($)
Goodwill
Balance as of July 31, 2017	$ 437,697
Translation adjustments	(3,993)
Balance as of October 31, 2017	433,704
ID Solutions [Member]
Goodwill
Balance as of July 31, 2017	391,864
Translation adjustments	(3,123)
Balance as of October 31, 2017	388,741
Workplace Safety [Member]
Goodwill
Balance as of July 31, 2017	45,833
Translation adjustments	(870)
Balance as of October 31, 2017	$ 44,963