Acquisitions - Additional Information (Detail) - USD ($) $ in Thousands		9 Months Ended
	Jun. 15, 2015	Jul. 31, 2015	Oct. 31, 2014
Business Acquisition [Line Items]
Acquisition of businesses, net of cash acquired		$ 14,936
Goodwill		1,047,086	$ 1,052,537
Advanced Technology Systems [Member]
Business Acquisition [Line Items]
Goodwill		$ 640,727	$ 631,433
Advanced Technology Systems [Member] | Liquidyn [Member]
Business Acquisition [Line Items]
Acquired percent of the outstanding shares	100.00%
Acquisition of businesses, net of cash acquired	$ 14,565
Cash acquired from business acquisition	656
Goodwill	10,725
Identifiable intangible assets	3,991
Advanced Technology Systems [Member] | Liquidyn [Member] | Customer Relationships [Member]
Business Acquisition [Line Items]
Identifiable intangible assets	$ 1,285
Intangible assets amortization period	6 years
Advanced Technology Systems [Member] | Liquidyn [Member] | Trade Names [Member]
Business Acquisition [Line Items]
Identifiable intangible assets	$ 1,049
Intangible assets amortization period	11 years
Advanced Technology Systems [Member] | Liquidyn [Member] | Technology-Based Intangible Assets [Member]
Business Acquisition [Line Items]
Identifiable intangible assets	$ 1,421
Intangible assets amortization period	5 years
Advanced Technology Systems [Member] | Liquidyn [Member] | Non-compete Agreements [Member]
Business Acquisition [Line Items]
Identifiable intangible assets	$ 236
Intangible assets amortization period	2 years