Acquisitions - Additional Information (Detail) $ in Thousands, € in Millions				3 Months Ended	9 Months Ended
	Jan. 30, 2015 USD ($)	Jan. 30, 2015 EUR (€)	Dec. 20, 2013 USD ($)	Jan. 30, 2015 USD ($)	Jul. 31, 2015 USD ($)	Jan. 31, 2015 USD ($)	Oct. 31, 2014 USD ($)
Business Acquisition [Line Items]
Goodwill					$ 1,040,443		$ 1,071,786
Sunbank Family Of Companies LLC.
Business Acquisition [Line Items]
Business acquired			$ 51,700
First installment of contingent consideration			$ 5,000		1,300
Contingent consideration achievement period of certain sales levels			2 years
Remaining additional contingent consideration					$ 3,700
Belgium-based | Barco N V
Business Acquisition [Line Items]
Business acquired	$ 171,000	€ 150
Foreign currency exchange loss				$ (2,900)
Business acquisition working capital adjustment				$ 15,000
Acquisition-related costs	3,400
Estimated fair value adjustment for inventory, will be recognized as cost of goods sold	$ 7,100
Fair value adjustment for inventory, cost of goods sold period, months	13 months	13 months
Goodwill						$ 48,001