Restructuring Charges - Additional Information (Detail)	Apr. 26, 2019
March 2016 Restructuring
Restructuring Cost and Reserve [Line Items]
Reduction of global work force	11.00%
November 2016 Restructuring
Restructuring Cost and Reserve [Line Items]
Reduction of global work force	6.00%
May 2018 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%