SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2011
Statement of Operations Data:
Revenues	$ 264,402	$ 259,147	$ 238,339	$ 235,151	$ 245,795	$ 228,540	$ 210,457	$ 194,967	$ 997,039	$ 879,759	$ 758,155
Cost of revenues	91,695	91,411	81,540	86,347	92,989	84,063	77,931	71,333
Selling, general and administrative	72,099	72,218	67,852	64,516	72,753	63,764	61,304	57,222	276,685	255,043	225,033
Research and development costs	30,326	29,098	26,599	25,095	25,581	24,838	22,377	23,386	111,118	96,182	88,086
Income from operations before income taxes	58,502	55,933	52,467	49,373	45,598	47,627	38,972	32,262	216,275	164,459	143,393
Income tax expense	(21,229)	(17,527)	(19,389)	(18,429)	(19,295)	(17,713)	(14,688)	(11,853)	(76,574)	(63,549)	(45,182)
Income from operations	37,273	38,406	33,078	30,944	26,303	29,914	24,284	20,409	139,701	100,910	97,808
Less net income (loss) attributable to noncontrolling interests	(64)	(43)	(48)	(1,588)	(218)	(53)	16	17	(1,743)	(238)	(455)
Net income attributable to Bally Technologies, Inc.	$ 37,337	$ 38,449	$ 33,126	$ 32,532	$ 26,521	$ 29,967	$ 24,268	$ 20,392	$ 141,444	$ 101,148	$ 98,263
Basic earnings per share attributable to Bally Technologies, Inc.:
Basic earnings per share (in dollars per share)	$ 0.96	$ 0.95	$ 0.82	$ 0.80	$ 0.63	$ 0.70	$ 0.57	$ 0.47	$ 3.53	$ 2.35	$ 1.89
Diluted earnings per share attributable to Bally Technologies, Inc.:
Diluted earnings per share (in dollars per share)	$ 0.95	$ 0.93	$ 0.80	$ 0.77	$ 0.61	$ 0.67	$ 0.54	$ 0.45	$ 3.45	$ 2.28	$ 1.81