Debt (Details) In Thousands, unless otherwise specified	3 Months Ended					3 Months Ended		3 Months Ended			3 Months Ended
	Sep. 30, 2012 USD ($)	Jun. 30, 2012 USD ($)	Jun. 13, 2012 USD ($)	Jun. 30, 2011	Sep. 30, 2012 Revolving Credit Facility [Member] USD ($)	Sep. 30, 2012 Senior Credit Facility [Member] USD ($)	Sep. 30, 2012 Other Credit Facility [Member] USD ($)	Sep. 30, 2012 Quebec Silicon Acquisition Revolving Credit Facility [Member] USD ($)	Sep. 30, 2012 Quebec Silicon Acquisition Revolving Credit Facility [Member] CAD	Sep. 30, 2011 Quebec Silicon Acquisition Revolving Credit Facility [Member] CAD	Sep. 30, 2012 Export Financing [Member] USD ($)	Jun. 30, 2012 Export Financing [Member] USD ($)	Sep. 30, 2012 Other Short term Debt [Member] USD ($)	Jun. 30, 2012 Other Short term Debt [Member] USD ($)
Short-term Debt [Line Items]
Outstanding balance	$ 323	$ 317									$ 0	$ 0	$ 323	$ 317
Weighted Average Interest Rate (in hundredths)											0.00%	0.00%	7.00%	5.00%
Unused credit line	9,801	9,269									9,801	9,269	0	0
Period for short-term export financing agreements, minimum (in months)											7 months
Period for short-term export financing agreements, maximum (in months)											11 months
Line of Credit Facility [Line Items]
Outstanding balance	9,000	9,000			9,000	126,645	7,729	7,729		7,604
Weighted average interest rate (in hundredths)					2.38%	1.98%	5.00%
Unused commitment					11,000	172,915	7,517
Total commitment	440				20,000	300,000	15,246		15,000
Term of credit facility	5 years
Sublimit for swingline loans						10,000
Sublimit letter of credit						25,000
Debt refinance and closing costs						96,550
Purchase price financed with revolving credit facility			31,800			31,800
Credit facility, additional borrowing availability						172,915
Aggregate amount by which maximum borrowing capacity may be increased						$ 125,000
Interest rate on borrowings under the credit agreement						Interest on borrowings under the credit agreement is payable, at the Company's election, at either (a) a base rate (the higher of (i) the U.S. federal funds rate plus 0.50% per annum, (ii) the Administrative Agent's prime rate or (iii) an adjusted London Interbank Offered Rate for loans with a one month interest period plus 1.00% per annum plus a margin ranging from 0.75% to 1.50% per annum (such margin determined by reference to the leverage ratio set forth in the credit agreement), or (b) the adjusted London Interbank Offered Rate plus a margin ranging from 1.75% to 2.50% per annum (such margin determined by reference to the leverage ratio set forth in the credit agreement)
Period following written demand by lender after which borrowings become due and payable				10 months
Interest rate on borrowings, variable rate basis								Canadian prime	Canadian prime
Interest rate on borrowings, basis spread on variable rate (in hundredths)								2.00%	2.00%
Interest rate at period end (in hundredths)								5.00%	5.00%