Investments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Feb. 28, 2015	Mar. 01, 2014	May 31, 2014
Investment [Line Items]
Investment in time deposits and certificate of deposits	$ 34.9		$ 32.7
Investment in time deposits and certificate of deposits, less than twelve months	23.7		31.7
Investment in time deposits and certificate of deposits, greater than twelve months	11.2		1.0
Investments, which are included in non-current assets	$ 0.6		$ 0.5
Proceeds from the sale of securities description	.2	0.1
Gross realized gains and losses on sale, description	less than $0.1 million	less than $0.1 million
Net unrealized holding gains, description	less than $0.1 million	less than $0.1 million