Marketable Securities - Additional Information (Detail) (USD $)	0 Months Ended
	Feb. 14, 2015	Feb. 14, 2015 Securities	Aug. 30, 2014
Investments, Debt and Equity Securities [Abstract]
Available for sale securities debt maturity period range	Less than one year to approximately three years
Number of securities available for sale loss position		53
Available-For-Sale Marketable Securities, Gross Unrealized Losses		$ 184,000	$ 93,000
Marketable securities transferred	$ 45,300,000