Quarterly Financial Data (Unaudited) (Details) - Quarterly Financial Data (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Aug. 30, 2014	May 31, 2014	Mar. 01, 2014	Nov. 30, 2013	Aug. 31, 2013	May 25, 2013	Feb. 23, 2013	Nov. 24, 2012	Aug. 30, 2014	Aug. 31, 2013	Aug. 25, 2012
Quarterly Financial Data (Unaudited) (Details) - Quarterly Financial Data (Unaudited) [Line Items]
Revenues	$ 351,988	$ 352,238	$ 343,967	$ 346,704	$ 352,876	$ 335,764	$ 334,306	$ 332,569	$ 1,394,897	$ 1,355,515	$ 1,256,289
Income before income taxes	47,657	50,114	41,224	56,356	48,137	45,831	43,215	50,426	195,351	187,609	150,734
Provision for income taxes	18,785	19,170	15,577	21,894	17,576	17,109	16,573	19,666	75,426	70,924	55,745
Net income	28,872	30,944	25,647	34,462	30,561	28,722	26,642	30,760	119,925	116,685	94,989
Common Stock (in Dollars per share)	$ 1.43	$ 1.53	$ 1.27	$ 1.71	$ 1.52	$ 1.43	$ 1.33	$ 1.54	$ 5.95	$ 5.81	$ 4.76
Income allocated to – Basic									119,925	116,685	94,989
Common Stock	28,631	30,637	25,326	34,031	30,178	28,307	26,196	30,244	118,626	114,927	93,358
Common Stock (in Shares)	20,007	19,977	19,924	19,891	19,882	19,820	19,747	19,693	19,939	19,789	19,616
Common Class A [Member]
Quarterly Financial Data (Unaudited) (Details) - Quarterly Financial Data (Unaudited) [Line Items]
Income per share – Basic (in Dollars per share)	$ 1.51	$ 1.62	$ 1.34	$ 1.81	$ 1.61	$ 1.51	$ 1.40	$ 1.62	$ 6.29	$ 6.14	$ 5.02
Income allocated to – Basic	22,876	24,493	20,267	27,208	24,123	22,638	20,963	24,191	94,849	91,916	74,643
Weighted average number of shares outstanding – Basic (in Shares)	15,113	15,102	15,077	15,029	15,017	14,993	14,962	14,925	15,080	14,975	14,882
Common Class B [Member]
Quarterly Financial Data (Unaudited) (Details) - Quarterly Financial Data (Unaudited) [Line Items]
Income per share – Basic (in Dollars per share)	$ 1.21	$ 1.30	$ 1.08	$ 1.45	$ 1.29	$ 1.21	$ 1.12	$ 1.30	$ 5.03	$ 4.91	$ 4.01
Income allocated to – Basic	$ 5,742	$ 6,127	$ 5,041	$ 6,798	$ 6,033	$ 5,647	$ 5,209	$ 6,025	$ 23,705	$ 22,913	$ 18,630
Weighted average number of shares outstanding – Basic (in Shares)	4,741	4,722	4,687	4,693	4,694	4,675	4,647	4,647	4,711	4,666	4,643