Related Party Transactions (Details) (Transmission Service Agreement [Member], IDT [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended
Oct. 31, 2013	Oct. 31, 2012
Transmission Service Agreement [Member] \| IDT [Member]
Related Party Transaction, Due from (to) Related Party [Abstract]
Included in direct cost of revenues	$ 28	$ 306
Included in selling, general and administrative expenses	$ 254	$ 181

Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 850

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

Name:	us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration