Segment And Geographic Reporting (Narrative) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
Jun. 30, 2012
Segment Reporting Information [Line Items]
Earnings impacted by inventory lower of cost or market adjustments	$ 8.3

Earnings impacted by inventory lower of cost or market adjustments.

No definition available.

Name:	iivi_EarningsImpactedByInventoryLowerOfCostOrMarketAdjustments
Namespace Prefix:	iivi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration