Condensed Consolidated Statements of Stockholders Equity Statement - USD ($) $ in Thousands	Total	Common Stock	Treasury Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss
Beginning balance at Aug. 25, 2018	$ 672,601	$ 706	$ 0	$ 614,399	$ 58,294	$ (798)
Beginning balance (in shares) at Aug. 25, 2018		70,605,675
Beginning balance, Treasury (in shares) at Aug. 25, 2018			0
Net income	15,257				15,257
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	1,061			1,061
Foreign currency translation adjustments	142					142
Shares issued upon vesting of Restricted Stock Units	0	$ 1		(1)
Shares issued upon vesting of Restricted Stock Units (in shares)		67,500
Exercise of options to purchase common stock	53	$ 0		53
Exercise of options to purchase common stock (in shares)		4,444
Warrant conversion	113,464	$ 112		113,352
Warrant conversion (in shares)		11,200,299
Ending balance (in shares) at Nov. 24, 2018		81,877,918
Ending balance, Treasury (in shares) at Nov. 24, 2018			0
Ending balance at Nov. 24, 2018	802,578	$ 819	$ 0	728,864	73,551	(656)
Beginning balance at Aug. 25, 2018	672,601	$ 706	$ 0	614,399	58,294	(798)
Beginning balance (in shares) at Aug. 25, 2018		70,605,675
Beginning balance, Treasury (in shares) at Aug. 25, 2018			0
Net income	41,445
Foreign currency translation adjustments	(291)
Ending balance (in shares) at May. 25, 2019		81,928,540
Ending balance, Treasury (in shares) at May. 25, 2019			75,989
Ending balance at May. 25, 2019	829,986	$ 819	$ (1,664)	732,181	99,739	(1,089)
Beginning balance at Nov. 24, 2018	802,578	$ 819	$ 0	728,864	73,551	(656)
Beginning balance (in shares) at Nov. 24, 2018		81,877,918
Beginning balance, Treasury (in shares) at Nov. 24, 2018			0
Net income	12,722				12,722
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	1,417			1,417
Repurchase of common stock (in shares)			(6,729)
Repurchase of common stock (value)	(127)		$ (127)
Foreign currency translation adjustments	(179)					(179)
Shares issued upon vesting of Restricted Stock Units	(5)			(5)
Shares issued upon vesting of Restricted Stock Units (in shares)		505
Exercise of options to purchase common stock	308			308
Exercise of options to purchase common stock (in shares)		36,790
Ending balance (in shares) at Feb. 23, 2019		81,915,213
Ending balance, Treasury (in shares) at Feb. 23, 2019			6,729
Ending balance at Feb. 23, 2019	816,714	$ 819	$ (127)	730,584	86,273	(835)
Net income	13,466				13,466
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	1,444			1,444
Repurchase of common stock (in shares)			(69,260)
Repurchase of common stock (value)	(1,537)		$ (1,537)
Foreign currency translation adjustments	(254)					(254)
Shares issued upon vesting of Restricted Stock Units	(4)			(4)
Shares issued upon vesting of Restricted Stock Units (in shares)		210
Exercise of options to purchase common stock	157			157
Exercise of options to purchase common stock (in shares)		13,117
Ending balance (in shares) at May. 25, 2019		81,928,540
Ending balance, Treasury (in shares) at May. 25, 2019			75,989
Ending balance at May. 25, 2019	829,986	$ 819	$ (1,664)	732,181	99,739	(1,089)
Beginning balance at Aug. 31, 2019	$ 837,444	$ 820	$ (2,145)	733,775	105,830	(836)
Beginning balance (in shares) at Aug. 31, 2019		81,973,284
Beginning balance, Treasury (in shares) at Aug. 31, 2019	98,234		98,234
Net income	$ (4,793)				(4,793)
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	$ 1,673			1,673
Public equity officering (in shares)	13,379,205
Public equity offering	$ 349,219	$ 134		349,085
Shares issued upon vesting of Restricted Stock Units	(70)	$ 0		(70)
Shares issued upon vesting of Restricted Stock Units (in shares)		46,911
Exercise of options to purchase common stock	208	$ 0		208
Exercise of options to purchase common stock (in shares)		17,372
Ending balance (in shares) at Nov. 30, 2019		95,416,772
Ending balance, Treasury (in shares) at Nov. 30, 2019			98,234
Ending balance at Nov. 30, 2019	1,183,681	$ 954	$ (2,145)	1,084,671	101,037	(836)
Beginning balance at Aug. 31, 2019	$ 837,444	$ 820	$ (2,145)	733,775	105,830	(836)
Beginning balance (in shares) at Aug. 31, 2019		81,973,284
Beginning balance, Treasury (in shares) at Aug. 31, 2019	98,234		98,234
Net income	$ 22,273
Foreign currency translation adjustments	$ (80)
Ending balance (in shares) at May. 30, 2020		95,476,860
Ending balance, Treasury (in shares) at May. 30, 2020	98,234		98,234
Ending balance at May. 30, 2020	$ 1,215,649	$ 955	$ (2,145)	1,089,652	128,103	(916)
Beginning balance at Nov. 30, 2019	1,183,681	$ 954	$ (2,145)	1,084,671	101,037	(836)
Beginning balance (in shares) at Nov. 30, 2019		95,416,772
Beginning balance, Treasury (in shares) at Nov. 30, 2019			98,234
Net income	10,657				10,657
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	2,122			2,122
Foreign currency translation adjustments	(141)					(141)
Shares issued upon vesting of Restricted Stock Units	(10)	$ 0		(10)
Shares issued upon vesting of Restricted Stock Units (in shares)		771
Exercise of options to purchase common stock	724	$ 1		723
Exercise of options to purchase common stock (in shares)		58,994
Ending balance (in shares) at Feb. 29, 2020		95,476,537
Ending balance, Treasury (in shares) at Feb. 29, 2020			98,234
Ending balance at Feb. 29, 2020	1,197,033	$ 955	$ (2,145)	1,087,506	111,694	(977)
Net income	16,409				16,409
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	2,150			2,150
Foreign currency translation adjustments	61					61
Shares issued upon vesting of Restricted Stock Units	$ (4)	$ 0		(4)
Shares issued upon vesting of Restricted Stock Units (in shares)		323
Ending balance (in shares) at May. 30, 2020		95,476,860
Ending balance, Treasury (in shares) at May. 30, 2020	98,234		98,234
Ending balance at May. 30, 2020	$ 1,215,649	$ 955	$ (2,145)	$ 1,089,652	$ 128,103	$ (916)