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Fair Value Measurements - Additional Information (Detail) - USD ($)
$ in Thousands
Jan. 31, 2018
Jul. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Goodwill, Carrying Value $ 443,873 $ 437,697
Debt, Fair Value 74,668 109,303
Debt, Carrying Value 70,624 104,536
Workplace Safety [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Goodwill, Carrying Value $ 47,899 $ 45,833