Quarterly Financial Data (Unaudited) (Details) - Quarterly Financial Data (Unaudited) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Aug. 29, 2015	May. 30, 2015	Feb. 28, 2015	Nov. 29, 2014	Aug. 30, 2014	May. 31, 2014	Mar. 01, 2014	Nov. 30, 2013	Aug. 29, 2015	Aug. 30, 2014	Aug. 31, 2013
Quarterly Financial Data (Unaudited) (Details) - Quarterly Financial Data (Unaudited) [Line Items]
Revenues	$ 359,208	$ 365,574	$ 361,462	$ 370,361	$ 351,988	$ 352,238	$ 343,967	$ 346,704	$ 1,456,605	$ 1,394,897	$ 1,355,515
Income before income taxes	46,215	52,843	41,376	60,834	47,657	50,114	41,224	56,356	201,268	195,351	187,609
Provision for income taxes	17,274	20,344	15,930	23,421	18,785	19,170	15,577	21,894	76,969	75,426	70,924
Net income	$ 28,941	$ 32,499	$ 25,446	$ 37,413	$ 28,872	$ 30,944	$ 25,647	$ 34,462	$ 124,299	$ 119,925	$ 116,685
Income per share – diluted
Common Stock (in Dollars per share)	$ 1.43	$ 1.61	$ 1.26	$ 1.85	$ 1.43	$ 1.53	$ 1.27	$ 1.71	$ 6.15	$ 5.95	$ 5.81
Income allocated to – basic
Income allocated to - basic									$ 124,299	$ 119,925	$ 116,685
Income allocated to – diluted
Common Stock	$ 28,821	$ 32,310	$ 25,235	$ 37,101	$ 28,631	$ 30,637	$ 25,326	$ 34,031	$ 123,472	$ 118,626	$ 114,927
Weighted average number of shares outstanding – diluted
Common Stock (in Shares)	20,142	20,118	20,065	20,008	20,007	19,977	19,924	19,891	20,079	19,939	19,789
Common Class A [Member]
Income per share – basic
Income per share - basic (in Dollars per share)	$ 1.51	$ 1.70	$ 1.33	$ 1.96	$ 1.51	$ 1.62	$ 1.34	$ 1.81	$ 6.50	$ 6.29	$ 6.14
Income allocated to – basic
Income allocated to - basic	$ 23,011	$ 25,817	$ 20,182	$ 29,649	$ 22,876	$ 24,493	$ 20,267	$ 27,208	$ 98,665	$ 94,849	$ 91,916
Weighted average number of shares outstanding – basic
Weighted average number of shares outstanding - basic (in Shares)	15,210	15,207	15,185	15,128	15,113	15,102	15,077	15,029	15,182	15,080	14,975
Common Class B [Member]
Income per share – basic
Income per share - basic (in Dollars per share)	$ 1.21	$ 1.36	$ 1.06	$ 1.57	$ 1.21	$ 1.30	$ 1.08	$ 1.45	$ 5.20	$ 5.03	$ 4.91
Income allocated to – basic
Income allocated to - basic	$ 5,803	$ 6,483	$ 5,041	$ 7,434	$ 5,742	$ 6,127	$ 5,041	$ 6,798	$ 24,761	$ 23,705	$ 22,913
Weighted average number of shares outstanding – basic
Weighted average number of shares outstanding - basic (in Shares)	4,795	4,773	4,741	4,741	4,741	4,722	4,687	4,693	4,763	4,711	4,666