Long-term Debt - Additional Information - Senior Credit Facility (Detail) (USD $) In Millions, unless otherwise specified	0 Months Ended	6 Months Ended
	May 31, 2014	May 31, 2014	Nov. 30, 2013	Aug. 16, 2012	May 30, 2012
Debt Instrument [Line Items]
Term loan borrowings under credit facility					$ 50.0
Second lien indebtedness				510
Maximum term loan to draw				50
Term loan facility principal amount Senior Debt 100	96.3	96.3	42.5
Credit facility maturity date	Jan. 31, 2015
Percentage of equity interests owned or held by the loan parties		66.00%
Percentage of non-voting stock owned or held by the loan parties		100.00%
Outstanding letters of credit	58.1	58.1
Standby letters of credit outstanding	100.0	100.0
Outstanding under the term loan facility	100.0	100.0
Senior Credit Facility [Member]
Debt Instrument [Line Items]
Interest at LIBOR plus basis points		2.50%
Commitment fee basis points		0.50
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Percentage of equity interests owned or held by the loan parties		65.00%
Percentage of non-voting stock owned or held by the loan parties		100.00%
Interest at LIBOR plus basis points		2.50%
Debt instrument, fronting fee per annum, basis points	0.25	0.25
Second Amendment [Member]
Debt Instrument [Line Items]
Credit facility expire period		2013-08
Third Amendment [Member]
Debt Instrument [Line Items]
Revolving credit facility aggregate principal amount	200.0	200.0
Standby letters of credit	100.0	100.0
Swingline loans	5.0	5.0
Term loan facility principal amount Senior Debt 100	100.0	100.0
Credit facility maturity date		May 30, 2019
Minimum [Member]
Debt Instrument [Line Items]
Sale leasebacks					20.0
Minimum [Member] | Third Amendment [Member]
Debt Instrument [Line Items]
Term loan facility amortize percentage	5.00%	5.00%
Maximum [Member]
Debt Instrument [Line Items]
Sale leasebacks					$ 30.0