Special Charges (Textual) (Details) $ in Thousands	3 Months Ended			6 Months Ended	12 Months Ended
	Jan. 28, 2017 USD ($) employee	Apr. 30, 2016 USD ($)	Jan. 30, 2016 USD ($)	Apr. 30, 2016 employee	Oct. 29, 2016 USD ($)
Restructuring Cost and Reserve [Line Items]
Special charges | $	$ 49,463		$ 0		$ 13,684
Early Retirement Action [Member]
Restructuring Cost and Reserve [Line Items]
Special charges | $	41,337				0
Reduction of Operating Costs Action [Member]
Restructuring Cost and Reserve [Line Items]
Special charges | $	$ 8,126				$ 13,684
Workforce Reductions Plan 2016 [Member] | Reduction of Operating Costs Action [Member]
Restructuring Cost and Reserve [Line Items]
Special charges | $		$ 13,700
Number of manufacturing, engineering and selling, marketing, general and administrative employees related to operating costs action | employee				123
Number of employees still employed who are planned to be separated | employee	31
Workforce Reductions Plan 2017 [Member] | Early Retirement Action [Member]
Restructuring Cost and Reserve [Line Items]
Special charges | $	$ 41,300
Number of manufacturing, engineering and selling, marketing, general and administrative employees related to operating costs action | employee	225
Number of employees still employed who are planned to be separated | employee	225
Workforce Reductions Plan 2017 [Member] | Reduction of Operating Costs Action [Member]
Restructuring Cost and Reserve [Line Items]
Special charges | $	$ 8,126
Number of manufacturing, engineering and selling, marketing, general and administrative employees related to operating costs action | employee	177
Number of employees still employed who are planned to be separated | employee	177