Restructuring Charges - Additional Information (Detail)	Jul. 31, 2020
May 2020 Restructuring | Maximum
Restructuring Cost and Reserve [Line Items]
Reduction of global work force	1.00%
May 2019 Restructuring
Restructuring Cost and Reserve [Line Items]
Reduction of global work force	2.00%
April 2019 Restructuring
Restructuring Cost and Reserve [Line Items]
Reduction of global work force	1.00%