Acquisitions 1 (Details) (Atlanta Capital [Member], USD $) In Millions, unless otherwise specified			12 Months Ended
	Apr. 30, 2014	Oct. 31, 2013	Oct. 31, 2013 Call Option [Member]	Oct. 31, 2013 Put Option [Member]
Business Acquisition Contingent Consideration [Line Items]
Minority interest ownership percentage purchased by parent			0.20%	0.30%
Company's increase in profit interest percentage, during the period			3.40%	3.80%
Company's profit interest percentage, beginning of period		80.30%
Company's profit interest percentage, end of period	87.50%
Purchase of non-controlling interests			$ 12.8	$ 14.1
Company's capital ownership interest, beginning of period		99.40%
Company's capital ownership interest at the end of the period	99.90%