Consolidated Statements of Shareholders' Equity (Deficit) - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock Outstanding	Common Stock	Paid-in Capital	Retained Earnings	Cumulative Other Comprehensive Income (Loss)	Treasury Stock
Beginning Balance at Mar. 03, 2018	$ 277,570		$ 6	$ 168,543	$ 726,232	$ (7,477)	$ (609,734)
Beginning Balance, Common Stock at Mar. 03, 2018		4,163
Net loss	(130,032)				(130,032)
Cumulative effect of accounting change	7,020				7,020
Other comprehensive income (loss)	(742)					(742)
Stock-based compensation expense	2,266			(11,509)			13,775
Stock-based compensation expense (in shares)		52
Stock purchase plan and other	1,104			(7,990)			9,094
Stock purchase plan and other (in shares)		28
Ending Balance at Dec. 01, 2018	157,186		6	149,044	603,220	(8,219)	(586,865)
Ending Balance, Common Stock at Dec. 01, 2018		4,243
Beginning Balance at Sep. 01, 2018	207,168		6	137,510	653,661	(7,400)	(576,609)
Beginning Balance, Common Stock at Sep. 01, 2018		4,278
Net loss	(50,441)				(50,441)
Other comprehensive income (loss)	(819)					(819)
Stock-based compensation expense	886			14,282			(13,396)
Stock-based compensation expense (in shares)		(46)
Stock purchase plan and other	392			(2,748)			3,140
Stock purchase plan and other (in shares)		11
Ending Balance at Dec. 01, 2018	157,186		6	149,044	603,220	(8,219)	(586,865)
Ending Balance, Common Stock at Dec. 01, 2018		4,243
Beginning Balance at Mar. 02, 2019	89,529		6	138,469	534,419	(7,861)	(575,504)
Beginning Balance, Common Stock at Mar. 02, 2019		4,281
Net loss	(241,220)				(241,220)
Cumulative effect of accounting change	1,543				1,543
Other comprehensive income (loss)	49					49
Stock-based compensation expense	1,847			18,986			(17,139)
Stock-based compensation expense (in shares)		(57)
Stock purchase plan and other	554			(15,580)			16,134
Stock purchase plan and other (in shares)		52
Ending Balance at Nov. 30, 2019	(147,698)		6	141,875	294,742	(7,812)	(576,509)
Ending Balance, Common Stock at Nov. 30, 2019		4,276
Beginning Balance at Aug. 31, 2019	(89,676)		6	141,943	353,698	(7,779)	(577,544)
Beginning Balance, Common Stock at Aug. 31, 2019		4,272
Net loss	(58,956)				(58,956)
Other comprehensive income (loss)	(33)					(33)
Stock-based compensation expense	929			(83)			1,012
Stock-based compensation expense (in shares)		4
Stock purchase plan and other	38			15			23
Ending Balance at Nov. 30, 2019	$ (147,698)		$ 6	$ 141,875	$ 294,742	$ (7,812)	$ (576,509)
Ending Balance, Common Stock at Nov. 30, 2019		4,276