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Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Jan. 31, 2012 Location	Jan. 31, 2011
Income Taxes [Line Items]
Effective tax rate on income from continuing operations	41.20%	38.50%
Unrecognized tax benefit	$ 96.1
Unrecognized tax benefits, accrued interest	1.0
Number of states in which entity operates	50
Domestic Country
Income Taxes [Line Items]
Income tax returns open for examination	October 31, 2006 through October 31, 2010
Internal Revenue Service (IRS)
Income Taxes [Line Items]
Income tax returns open for examination	2006 - 2008
State and Local Jurisdiction
Income Taxes [Line Items]
Income tax returns open for examination	2006 - 2010
Current Liabilities
Income Taxes [Line Items]
Unrecognized tax benefit	$ 0.6
OneSource Services Inc \| Domestic Country
Income Taxes [Line Items]
Income tax returns open for examination	March 31, 2000 through November 14, 2007
Linc C Corporations \| Domestic Country
Income Taxes [Line Items]
Income tax returns open for examination	December 31, 2007 through December 31, 2010

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 statutory penalties accrued as of the date of the statement of financial position for a tax position claimed or expected to be claimed by the entity, in its tax return, that does not meet the minimum statutory threshold to avoid payment of penalties.

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