Acquisitions - Weighted-average Useful Lives of Acquired Other Intangible Assets (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
	Jul. 31, 2014	Jul. 31, 2014
Selling, General and Administrative Expenses
Business Acquisition
Business combination, acquisition related costs	$ 0.2	$ 0.4
Air Serv | Other Identifiable Intangibles | Customer Contracts And Relationships
Business Acquisition
Weighted-average useful life for the acquired intangible assets		14 years
HHA | Other Identifiable Intangibles | Customer Contracts And Relationships
Business Acquisition
Weighted-average useful life for the acquired intangible assets		13 years
Alpha Mechanical, Inc. | Other Identifiable Intangibles | Customer Contracts And Relationships
Business Acquisition
Weighted-average useful life for the acquired intangible assets		9 years
Calvert-Jones | Other Identifiable Intangibles | Customer Contracts And Relationships
Business Acquisition
Weighted-average useful life for the acquired intangible assets		12 years
Blackjack | Other Identifiable Intangibles | Customer Contracts And Relationships
Business Acquisition
Weighted-average useful life for the acquired intangible assets		11 years
BEST | Other Identifiable Intangibles | Customer Contracts And Relationships
Business Acquisition
Weighted-average useful life for the acquired intangible assets		9 years