Basis of Presentation and Summary of Significant Accounting Policies (Schedule of Service Inventory) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Jul. 03, 2011
Accounting Policies [Abstract]
Service Inventory	$ 13,109	$ 13,555
Less: Excess and Obsolete Inventory	5,074	3,976
Service Inventory, Net	$ 8,035	$ 9,579

Inventory Valuation Reserves, Service Materials and Supplies

No definition available.

Name:	extr_InventoryValuationReservesServiceMaterialsAndSupplies
Namespace Prefix:	extr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant