Income Taxes (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Nov. 30, 2011	Nov. 30, 2010
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards, expiration date	2024
Tax credit carryforwards, expiration date	2031
Estimated interest and penalties	$ 0.1	$ 0.1
Accrued estimated interest and penalties	0.3	0.2
Cumulative undistributed foreign earnings	35.4
Years currently under income tax examination by the Internal Revenue Service	fiscal years 2009 and 2010
2024 Expiration[Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	70.1
Indefinite-Lived Carryforwards [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	30.4
Tax credit carryforwards	0.8
2031 Expiration [Member]
Operating Loss Carryforwards [Line Items]
Tax credit carryforwards	$ 14.3