Stockholders' Equity (Details) (USD $) In Thousands, except Share data, unless otherwise specified	0 Months Ended		3 Months Ended	12 Months Ended								1 Months Ended		12 Months Ended					12 Months Ended
	Oct. 29, 2010	Oct. 15, 2010	Sep. 30, 2010	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2009	Aug. 17, 2012	Sep. 16, 2010	Aug. 31, 2009	Oct. 03, 2005	Feb. 28, 2011 Solsil [Member]	Apr. 30, 2008 Solsil [Member]	Jun. 30, 2012 Solsil [Member]	Jun. 30, 2008 Solsil [Member]	Jun. 30, 2012 Quebec Silicon Limited Partnership [Member]	Jun. 30, 2010 Sale of a 49% membership interest in WVA LLC [Member]	Nov. 05, 2009 Sale of a 49% membership interest in WVA LLC [Member]	Jun. 30, 2012 Quebec Silicon Limited Partnership [Member]	Jun. 30, 2010 Common Stock [Member]	Jun. 30, 2009 Common Stock [Member]	Jun. 30, 2008 Common Stock [Member]	Jun. 30, 2009 UPO [Member]	Jun. 30, 2008 UPO [Member]	Oct. 03, 2005 UPO [Member]	Jun. 30, 2012 Warrant [Member]	Jun. 30, 2009 Warrant [Member]	Jun. 30, 2008 Warrant [Member]	Oct. 03, 2005 Warrant [Member]
Common Stock [Abstract]
Initial public offering - shares issued (in shares)							16,100,000													5,600,000
New shares issued (in shares)										5,600,000
Price per share (in dollars per share)										$ 7.00
Existing shares offered by selling stockholders (in shares)										10,500,000
Proceeds from issuance initial public offering, net of discounts and commissions						$ 36,456
Share sold pursuant to an underwriter's over-allotment option (in shares)										2,100,000
Underwriting discounts and commissions						2,744
Preferred Stock [Abstract]
Preferred Stock, Shares Authorized				1,000,000
Warrants [Abstract]
Redeemable common stock purchase warrants (in shares)											33,500,000
Exercise price (in dollars per share)																									$ 7.50				$ 5.00
Options to purchase warrants (in shares)																									1,675,000
Warrants exercised (in shares)																											166,668	699,440
Cashless exercise of UPOs (in shares)																							282,128	67,458
Warrants Issued (in shares)																					242,753	50,131					485,505	100,262
Warrants conversion factor							5.5 warrants for one share of the Company's common stock																			Each UPO consists of one share of the Company's common stock and two redeemable common stock purchase warrants
Warrants converted to common stock (in shares)																					3,484,417						19,164,294
Shares issued (in shares)																				1,775,933
Proceeds from Warrant Exercises				0	0	1,287														1,497
Treasury Stock [Abstract]
Authorized amount							25,000
Treasury stock purchased (in shares)							1,000
Average cost per share (in dollars per share)							$ 4.00
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Business Divestiture, Percentage of Business Sold																		49.00%
Increase in non controlling interest																	27,012		46,762
Dividends [Abstract]
Date dividend declared			Sep. 16, 2010
Dividend per common share (in dollars per share)								$ 0.25	$ 0.15
Total dividends paid	11,269
Date dividends paid	Oct. 29, 2010
Date of stockholders of record		Oct. 15, 2010
Business Acquisition [Line Items]
Company's ownership interest (in hundredths)														97.25%	81.00%	51.00%
Shares issued to former shareholders (in shares)															5,628,657
Shares issued to former shareholders and placed in escrow (in shares)															562,867
Shares released from escrow (in shares)												281,437	281,430
Purchase of all shares held by one of the minority partners														150
New shares issued and sold to the Company														3,500
Company's ownership interest after all transactions (in hundredths)														97.25%	81.00%	51.00%
Noncontrolling Interest [Abstract]
Increase ownership by noncontrolling interest														$ 3,500