EARNINGS PER SHARE (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2010
Amounts attributable to Bally Technologies, Inc.:
Income from continuing operations, net of tax									$ 101,148	$ 98,666	$ 109,223
Income from discontinued operations, net of tax											6,175
Gain (loss) on sale of discontinued operations, net of tax								(403)		(403)	22,079
Net income attributable to Bally Technologies, Inc.	26,521	29,967	24,268	20,392	25,456	23,766	27,252	21,789	101,148	98,263	137,477
After tax interest expense on convertible debt											14
Diluted earnings attributable to Bally Technologies, Inc.									$ 101,148	$ 98,263	$ 137,491
Weighted average common shares outstanding									42,985	51,960	54,576
Dilutive effect of:
Stock options, Restricted Stock Units ("RSU") and restricted stock (in shares)									1,435	2,459	3,063
Warrants (in shares)										1	14
Convertible debt (in shares)											22
Weighted average diluted shares outstanding (in shares)									44,420	54,420	57,675
Basic earnings per share attributable to Bally Technologies, Inc.:
Income from continuing operations (in dollars per share)					$ 0.53	$ 0.45	$ 0.51	$ 0.42	$ 2.35	$ 1.90	$ 2.00
Income from discontinued operations (in dollars per share)											$ 0.11
Gain (loss) on sale of discontinued operations (in dollars per share)								$ (0.01)		$ (0.01)	$ 0.41
Basic earnings per share (in dollars per share)	$ 0.63	$ 0.70	$ 0.57	$ 0.47	$ 0.53	$ 0.45	$ 0.51	$ 0.41	$ 2.35	$ 1.89	$ 2.52
Diluted earnings per share attributable to Bally Technologies, Inc.:
Income from continuing operations (in dollars per share)					$ 0.51	$ 0.43	$ 0.49	$ 0.40	$ 2.28	$ 1.82	$ 1.89
Income from discontinued operations (in dollars per share)											$ 0.11
Gain (loss) on sale of discontinued operations (in dollars per share)								$ (0.01)		$ (0.01)	$ 0.38
Diluted earnings per share (in dollars per share)	$ 0.61	$ 0.67	$ 0.54	$ 0.45	$ 0.51	$ 0.43	$ 0.49	$ 0.39	$ 2.28	$ 1.81	$ 2.38
Stock options, RSU and restricted stock having anti-dilutive effect in calculation of diluted earnings per share (in shares)									574	688	308