Stock-Based Compensation Plans (Narrative) (Details) $ / shares in Units, $ in Thousands			12 Months Ended
	Oct. 15, 2018 USD ($) employees $ / shares shares	Oct. 12, 2016 shares	Aug. 31, 2019 USD ($)	Aug. 25, 2018 USD ($) shares	Aug. 26, 2017 USD ($) shares	Aug. 27, 2016 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Accrued compensation				$ 29,350	$ 24,546
Options granted, shares | shares				72,710	63,800	10,000
2014 Incentive Compensation Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized | shares				3,600,000
Awards Excluding Stock Options and Stock Appreciation Rights [Member] | Maximum [Member] | 2014 Incentive Compensation Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized | shares				3,600,000
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Offering Date				15.00%
Stock Issued During Period, Shares, Employee Stock Purchase Plans | shares				2,760
Accrued compensation				$ 100
Term of sale restriction period after grant				1 year
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted | shares				167,781	156,801	240,270
Aggregate intrinsic value of awards outstanding				$ 10,600
Unrecognized compensation expense related to restricted stock awards				$ 5,600
Unrecognized compensation expense, period of recognition				1 year 2 months
Total fair value of awards vested				$ 7,100	$ 4,900	$ 2,200
Restricted Stock [Member] | Long-Term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Term of award				3 years
Term of sale restriction period after grant				1 year
Restricted Stock [Member] | Performance-based annual plan employee award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted | shares		17,532
Restricted Stock Units (RSUs) [Member] | 2014 Incentive Compensation Plan [Member] | Subsequent Event [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Closing price of common stock on grant date | $ / shares	$ 31.70
Restricted Stock Units (RSUs) [Member] | 2014 Incentive Compensation Plan [Member] | Subsequent Event [Member] | Forecasted stock-based comp expense [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense			$ 1,600
Restricted Stock Units (RSUs) [Member] | 2014 Incentive Compensation Plan [Member] | Key Management [Member] | Subsequent Event [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted | shares	77,869
Shares granted, value	$ 2,500
Number of Key Management employees | employees	40
Restricted Stock Units (RSUs) [Member] | 2014 Incentive Compensation Plan [Member] | Non Management Board Members [Member] | Subsequent Event [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted | shares	23,975
Shares granted, value	$ 800
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate intrinsic value of options outstanding				$ 600
Unrecognized compensation expense related to stock options				$ 1,000
Unrecognized compensation expense, period of recognition				1 year 9 months
Weighted average remaining contractual life for outstanding options				8 years 7 months
Stock options | 2014 Incentive Compensation Plan [Member] | Officers [Member] | Subsequent Event [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted, shares | shares	114,635