Long-Term Debt - Schedule of Maturities of Long-Term Debt (Detail) (USD $) In Millions, unless otherwise specified	Nov. 30, 2013	Nov. 30, 2012
Schedule Of Maturities Of Long Term Debt [Line Items]
Total debt	$ 699.2	$ 248.7
2014	2.9
2015	195.9
2016	40.3
2017	0.1
2021	460.0
Term Loan Due on 2016 [Member]
Schedule Of Maturities Of Long Term Debt [Line Items]
Total debt	45.0
2014	2.5
2015	2.5
2016	40.0
Convertible Subordinated Debentures, Bearing Interest at 4.0625% Maturing in December 2034 [Member]
Schedule Of Maturities Of Long Term Debt [Line Items]
Total debt	193.2
2015	193.2
7.125% Notes [Member]
Schedule Of Maturities Of Long Term Debt [Line Items]
Total debt	460.0
2021	460.0
Convertible Subordinated Debentures, Bearing Interest at 2.25% Maturing in November 2024 [Member]
Schedule Of Maturities Of Long Term Debt [Line Items]
Total debt	0.2
2014	0.2
Other Debt [Member]
Schedule Of Maturities Of Long Term Debt [Line Items]
Total debt	0.8
2014	0.2
2015	0.2
2016	0.3
2017	$ 0.1