ACCOUNTING POLICIES (Details 7) - USD ($)				3 Months Ended		12 Months Ended
	Jan. 17, 2018	Dec. 29, 2017	Nov. 08, 2017	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Earnings per share
Net loss attributable to stockholders of Overstock.com, Inc.				$ (50,909,000)	$ (5,903,000)
Less: Preferred stock dividends - declared and accumulated				27,000	27,000
Undistributed loss				(50,936,000)	(5,930,000)
Less: Undistributed loss allocated to participating securities				(1,186,000)	(157,000)
Net loss attributable to common shares				$ (49,750,000)	$ (5,773,000)
Net loss per common share—basic:
Net loss attributable to common shares-basic (in dollars per share)				$ (1.74)	$ (0.23)
Weighted average common shares outstanding-basic				28,566,000	25,290,000
Effect of dilutive securities:
Stock options and restricted stock awards (in shares)				0	0
Weighted average common shares outstanding-diluted				28,566,000	25,290,000
Net loss attributable to common shares-diluted (in dollars per share)				$ (1.74)	$ (0.23)
Anti-dilutive securities excluded from computation of earnings per share
Number of securities called by warrants or rights	1,250,000	2,472,188	3,722,188
Proceeds from exercise of stock warrants	$ 50,600,000	$ 100,000,000		$ 50,562,000	$ 0	$ 150,562,000	$ 0
Proceeds from issuance of stock warrants			$ 6,462,000	$ 0	$ 0	$ 6,462,000	$ 0
Exercise price of warrants or rights			$ 40.45
Stock options and restricted stock awards
Anti-dilutive securities excluded from computation of earnings per share
Anti-dilutive securities excluded from computation of earnings per share (in shares)				685,000	199,000
Warrant [Member]
Anti-dilutive securities excluded from computation of earnings per share
Anti-dilutive securities excluded from computation of earnings per share (in shares)				83,000	0