Operating Segments, by major customers and by segments (Details)	3 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Revenue, Major Customer [Line Items]
Percentage of consolidated net sales (in hundredths)	100.00%	100.00%
Noncontrolling interest's ownership interest in consolidated affiliate (in hundredths)	49.00%	49.00%
Dow Corning [Member]
Revenue, Major Customer [Line Items]
Percentage of consolidated net sales (in hundredths)	17.00%	21.00%
All Other Customers [Member]
Revenue, Major Customer [Line Items]
Percentage of consolidated net sales (in hundredths)	83.00%	79.00%