SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) (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
Statement of Operations Data:
Revenues	$ 245,795	$ 228,540	$ 210,457	$ 194,967	$ 213,680	$ 190,941	$ 182,726	$ 170,808	$ 879,759	$ 758,155	$ 778,191
Cost of revenues	92,989	84,063	77,931	71,333	80,574	68,181	65,722	59,179
Selling, general and administrative	72,753	63,764	61,304	57,222	60,672	57,562	55,185	51,614	255,043	225,033	203,195
Research and development costs	25,581	24,838	22,377	23,386	23,254	22,088	21,360	21,384	96,182	88,086	80,301
Income from continuing operations before income taxes	45,598	47,627	38,972	32,262	38,411	37,429	33,616	33,937	164,459	143,393	170,818
Income tax expense	(19,295)	(17,713)	(14,688)	(11,853)	(12,899)	(13,651)	(6,347)	(12,285)	(63,549)	(45,182)	(60,721)
Income from continuing operations	26,303	29,914	24,284	20,409	25,512	23,778	27,269	21,652	100,910	98,211	110,097
Gain (loss) on sale of discontinued operations, net of tax								(403)		(403)	22,079
Net income					25,512	23,778	27,269	21,249	100,910	97,808	139,357
Less net income (loss) attributable to noncontrolling interests	(218)	(53)	16	17	56	12	17	(540)	(238)	(455)	1,880
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
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
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
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