Contingent Acquisition Payments (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014	Oct. 31, 2012
Business Acquisition, Contingent Consideration [Line Items]
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High	$ 19.8
Business Acquisitions Twenty Fourteen [Member]
Business Acquisition, Contingent Consideration [Line Items]
Business Acquisition, Contingent Consideration, Fair Value	7.4
J.A. Thomas and Associates [Member]
Business Acquisition, Contingent Consideration [Line Items]
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High		25.0
Business Acquisition, Contingent Consideration, Fair Value	21.9
Non-employment Contingency [Member] | Business Acquisitions Twenty Fourteen [Member]
Business Acquisition, Contingent Consideration [Line Items]
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High	13.8
Employment Contracts [Member] | Business Acquisitions Twenty Fourteen [Member]
Business Acquisition, Contingent Consideration [Line Items]
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High	$ 6.9