EARNINGS PER SHARE (Details) (USD $) In Thousands, except Per Share data	3 Months Ended								12 Months Ended
	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2009	Sep. 30, 2009	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2009
Amounts attributable to Bally Technologies, Inc.:
Income from continuing operations, net of tax									$ 98,666	$ 109,223	$ 119,439
Income from discontinued operations, net of tax										6,175	6,870
Gain (loss) on sale of discontinued operations, net of tax				(403)	22,079				(403)	22,079
Net income attributable to Bally Technologies, Inc.	25,456	23,766	27,252	21,789	51,041	22,559	33,253	30,624	98,263	137,477	126,309
After tax interest expense on convertible debt										14	160
Diluted earnings attributable to Bally Technologies, Inc.									$ 98,263	$ 137,491	$ 126,469
Weighted average common shares outstanding (in shares)									51,960	54,576	54,449
Dilutive effect of:
Stock options, Restricted Stock Units ("RSU") and restricted stock (in shares)									2,459	3,063	2,423
Warrants (in shares)									1	14	7
Convertible debt (in shares)										22	179
Weighted average diluted shares outstanding (in shares)									54,420	57,675	57,058
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	$ 0.50	$ 0.37	$ 0.59	$ 0.53	$ 1.90	$ 2.00	$ 2.19
Income from discontinued operations (in dollars per share)					$ 0.03	$ 0.04	$ 0.02	$ 0.03		$ 0.11	$ 0.13
Gain (loss) on sale of discontinued operations (in dollars per share)				$ (0.01)	$ 0.40				$ (0.01)	$ 0.41
Basic earnings per share (in dollars per share)	$ 0.53	$ 0.45	$ 0.51	$ 0.41	$ 0.93	$ 0.41	$ 0.61	$ 0.56	$ 1.89	$ 2.52	$ 2.32
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	$ 0.48	$ 0.36	$ 0.56	$ 0.50	$ 1.82	$ 1.89	$ 2.10
Income from discontinued operations (in dollars per share)					$ 0.03	$ 0.03	$ 0.02	$ 0.03		$ 0.11	$ 0.12
Gain (loss) on sale of discontinued operations (in dollars per share)				$ (0.01)	$ 0.38				$ (0.01)	$ 0.38
Diluted earnings per share (in dollars per share)	$ 0.51	$ 0.43	$ 0.49	$ 0.39	$ 0.89	$ 0.39	$ 0.58	$ 0.53	$ 1.81	$ 2.38	$ 2.22
Stock options, RSU and restricted stock having anti-dilutive effect in calculation of diluted earnings per share (in shares)									688	308	1,975