Condensed Consolidated Stockholders' Statement of Equity - USD ($) $ in Thousands	Total	Common stock and paid-in capital	Retained earnings	Accumulated comprehensive income (loss)	Treasury stock
Balance, beginning of period at Aug. 27, 2016		$ 58,605	$ 620,546	$ 10,975	$ (421,767)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock		44,981
Stock-based compensation, net of forfeitures		2,146			60
Net income	$ 46,407		46,407
Common stock dividends			(12,738)
Other comprehensive income (loss)	(11,927)			(11,927)
Issuance of common stock					80,329
Payments for the purchase of common stock					(1,367)
Balance, end of period at May. 27, 2017	416,250	105,732	654,215	(952)	(342,745)
Balance, beginning of period at Feb. 25, 2017		105,093	641,192	(900)	(342,770)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock		(2)
Stock-based compensation, net of forfeitures		641			24
Net income	19,391		19,391
Common stock dividends			(6,368)
Other comprehensive income (loss)	(52)			(52)
Issuance of common stock					3
Payments for the purchase of common stock					(2)
Balance, end of period at May. 27, 2017	416,250	105,732	654,215	(952)	(342,745)
Balance, beginning of period at Aug. 26, 2017	441,674	106,289	679,138	(1,023)	(342,730)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock		(1,625)
Stock-based compensation, net of forfeitures		5,403			62
Net income	72,567		72,567
Common stock dividends			(9,557)
Other comprehensive income (loss)	2,066			2,066
Issuance of common stock					1,712
Payments for the purchase of common stock					(6,481)
Balance, end of period at May. 26, 2018	505,821	110,067	742,148	1,043	(347,437)
Balance, beginning of period at Feb. 24, 2018		106,609	712,809	907	(342,516)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock		(57)
Stock-based compensation, net of forfeitures		3,515			25
Net income	32,521		32,521
Common stock dividends			(3,182)
Other comprehensive income (loss)	136			136
Issuance of common stock					57
Payments for the purchase of common stock					(5,003)
Balance, end of period at May. 26, 2018	$ 505,821	$ 110,067	$ 742,148	$ 1,043	$ (347,437)