Commitments and Contingencies (Litigation) (Details) (VoiceAge Corporation and Callertone Innovations, Inc., USD $) In Millions, unless otherwise specified	3 Months Ended
Dec. 31, 2013
VoiceAge Corporation and Callertone Innovations, Inc.
Commitments and Contingencies Disclosure [Line Items]
Payments for litigation	$ 11.5

The amount of cash paid for the settlement of litigation or for other legal issues during the period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 25

-Subparagraph (g)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585

Name:	us-gaap_PaymentsForLegalSettlements
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration