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Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended							12 Months Ended
	Apr. 30, 2013 Location	Apr. 30, 2012	Apr. 30, 2013 Location	Apr. 30, 2012	Apr. 30, 2013 Domestic Country	Apr. 30, 2013 Domestic Country OneSource Services Inc	Apr. 30, 2013 Domestic Country Linc	Apr. 30, 2013 State and Local Jurisdiction	Apr. 30, 2013 Current Liabilities	Oct. 31, 2013 Scenario, Forecast
Income Taxes [Line Items]
Effective tax rate on income from continuing operations	39.20%	33.30%	33.20%	37.30%						39.00%
Federal Employment based tax credits		$ 1.2	$ 2.9	$ 1.2
Unrecognized tax benefit	88.8		88.8						0.6
Unrecognized tax benefits, accrued interest	$ 1.5		$ 1.5
Income tax returns open for examination					October 31, 2006 through October 31, 2012	March 31, 2000 through November 14, 2007	December 31, 2009 through December 31, 2010	2008-2012
Number of states in which entity operates	50		50

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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- Definition

This element represents the amount of interest expense accrued as of the date of the statement of financial position for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity.

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