Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Jun. 30, 2012
Current Assets
Cash and cash equivalents	$ 155,594	$ 134,944
Accounts receivable - less allowance for doubtful accounts of $1,583 at March 31, 2013 and $1,536 at June 30, 2012	103,640	104,761
Inventories	152,873	137,607
Deferred income taxes	9,652	10,796
Prepaid and refundable income taxes	6,549	8,488
Prepaid and other current assets	12,600	13,777
Total Current Assets	440,908	410,373
Property, plant & equipment, net	173,206	153,918
Goodwill	122,330	80,748
Other intangible assets, net	88,556	44,014
Investment	10,977	10,661
Deferred income taxes	3,507	145
Other assets	9,305	6,627
Total Assets	848,789	706,486
Current Liabilities
Accounts payable	25,248	29,420
Accrued compensation and benefits	25,836	27,234
Accrued income tax payable	5,919	8,761
Deferred income taxes	214	209
Other accrued liabilities	23,840	18,104
Total Current Liabilities	81,057	83,728
Long-term debt	121,183	12,769
Deferred income taxes	4,375	5,883
Other liabilities	14,248	12,720
Total Liabilities	220,863	115,100
Shareholders' Equity
Preferred stock, no par value; authorized - 5,000,000 shares; none issued
Common stock, no par value; authorized - 300,000,000 shares; issued - 70,103,916 shares at March 31, 2013; 69,626,883 shares at June 30, 2012	191,333	176,295
Accumulated other comprehensive income	12,092	10,238
Retained earnings	479,458	438,671
Shareholders' equity excluding treasury stock	682,883	625,204
Treasury stock, at cost, 8,011,707 shares at March 31, 2013 and 6,793,928 shares at June 30, 2012	56,654	35,247
Total II-VI Incorporated Shareholders' Equity	626,229	589,957
Noncontrolling Interests	1,697	1,429
Total Shareholders' Equity	627,926	591,386
Total Liabilities and Shareholders' Equity	$ 848,789	$ 706,486