Note 1 - Nature of Operations and Significant Accounting Policies (Details) - Presentation of the Reclassification of Certain Expenses - USD ($) $ in Thousands		12 Months Ended
		Aug. 26, 2015	Aug. 27, 2014	Aug. 28, 2013
Payroll and related costs
Payroll and related costs		$ 127,694	$ 126,046	$ 122,865
Other operating expenses
Other operating expenses		63,090	61,700	58,985
Occupancy costs
Occupancy costs		20,977	21,881	21,680
Selling, general and administrative
Selling, general and administrative expenses		38,758	40,686	36,123
Cost of culinary contract services
Cost of culinary contract services		14,786	16,847	15,604
Cost of franchise operations
Cost of franchise operations		$ 1,668	1,733	1,629
Scenario, Previously Reported [Member]
Payroll and related costs
Payroll and related costs			127,792	123,864
Other operating expenses
Other operating expenses			68,820	64,918
Occupancy costs
Occupancy costs			21,060	21,012
Selling, general and administrative
Selling, general and administrative expenses			35,038	32,217
Cost of culinary contract services
Cost of culinary contract services			16,177	14,874
Scenario, Adjustment [Member]
Cost of franchise operations
Cost of franchise operations	[1]		1,733	1,629
Scenario, Adjustment [Member] | Management Training Reclassification [Member]
Payroll and related costs
Payroll and related costs			(1,746)	(999)
Selling, general and administrative
Selling, general and administrative expenses			1,699	999
Scenario, Adjustment [Member] | Restaurant Level Marketing Expense Reclassification [Member]
Other operating expenses
Other operating expenses			(3,775)	(3,043)
Selling, general and administrative
Selling, general and administrative expenses			3,775	3,043
Scenario, Adjustment [Member] | Non-store Specific Travel and Insurance Expense Reclassification [Member]
Other operating expenses
Other operating expenses	[2]		(3,345)	(2,890)
Selling, general and administrative
Selling, general and administrative expenses			2,186	1,895
Scenario, Adjustment [Member] | Property Insurance Expense Reclassification [Member]
Occupancy costs
Occupancy costs			1,107	979
Scenario, Adjustment [Member] | Centralized Bakery and Facility Service Center Occupancy Reclassification [Member]
Occupancy costs
Occupancy costs			(286)	(311)
Selling, general and administrative
Selling, general and administrative expenses			286	311
Scenario, Adjustment [Member] | Culinary Services Administration Costs Reclassification [Member]
Selling, general and administrative
Selling, general and administrative expenses			(618)	(707)
Cost of culinary contract services
Cost of culinary contract services	[3]		670	730
Scenario, Adjustment [Member] | Franchise Administration Costs Reclassification [Member]
Selling, general and administrative
Selling, general and administrative expenses			$ (1,680)	$ (1,635)

[1] Includes costs previously classified in General and administrative expenses ($1,680 and $1,635 in fiscal 2014 and 2013, respectively) and costs previously in Payroll and related costs and Other operating expenses

[2] Reflects property and general liability insurance reclassified to Other operating expenses and corporate insurance reclassified to Selling, general and administrative expenses

[3] Includes costs previously classified in General and administrative expenses ($618 and $707 in fiscal 2014 and 2013, respectively) and costs previously in Payroll and related costs, Other operating expenses and Occupancy costs