Effective Tax Rate Reconciliation (Details)	12 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2010
Computed "expected" tax expense, percent	35.00%	35.00%	35.00%
State income taxes net of federal income tax benefits, percent	2.20%	2.60%	2.50%
Research and development credit, percent	(1.80%)	(2.00%)	(0.70%)
Domestic production activities deduction, percent	(2.10%)	(2.50%)	(3.00%)
Other reconciling net, percent	(0.20%)	0.70%	1.00%
Effective Income Tax Rate Continuing Operations, percent	33.10%	33.80%	34.80%