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Revenue Recognition (Details 1) - USD ($) $ in Thousands | 3 Months Ended
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Oct. 31, 2018 | Oct. 31, 2017
Revenue from External Customer [Line Items] |  |
Revenues, Total | $ 362,316 | $ 393,555
Outside the United States: |  |
Total outside the United States | 126,634 | 129,711
United States [Member] |  |
Revenue from External Customer [Line Items] |  |
Revenues, Total | 235,682 | 263,844
United Kingdom [Member] |  |
Outside the United States: |  |
Total outside the United States | 54,400 | 60,531
Netherlands [Member] |  |
Outside the United States: |  |
Total outside the United States | 50,922 | 49,709
Other [Member] |  |
Outside the United States: |  |
Total outside the United States | 21,312 | 19,471
Telecom & Payment Services [Member] |  |
Revenue from External Customer [Line Items] |  |
Revenues, Total | 351,849 | 385,082
Outside the United States: |  |
Total outside the United States | 124,099 | 127,904
Telecom & Payment Services [Member] | United States [Member] |  |
Revenue from External Customer [Line Items] |  |
Revenues, Total | 227,750 | 257,178
Telecom & Payment Services [Member] | United Kingdom [Member] |  |
Outside the United States: |  |
Total outside the United States | 54,392 | 60,531
Telecom & Payment Services [Member] | Netherlands [Member] |  |
Outside the United States: |  |
Total outside the United States | 50,922 | 49,709
Telecom & Payment Services [Member] | Other [Member] |  |
Outside the United States: |  |
Total outside the United States | 18,785 | 17,664
Total net2phone [Member] |  |
Revenue from External Customer [Line Items] |  |
Revenues, Total | 10,467 | 7,788
Outside the United States: |  |
Total outside the United States | 2,535 | 1,807
Total net2phone [Member] | United States [Member] |  |
Revenue from External Customer [Line Items] |  |
Revenues, Total | 7,932 | 5,981
Total net2phone [Member] | United Kingdom [Member] |  |
Outside the United States: |  |
Total outside the United States | 8 |
Total net2phone [Member] | Netherlands [Member] |  |
Outside the United States: |  |
Total outside the United States |  |
Total net2phone [Member] | Other [Member] |  |
Outside the United States: |  |
Total outside the United States | 2,527 | 1,807
All Other [Member] |  |
Revenue from External Customer [Line Items] |  |
Revenues, Total |  | 685
Outside the United States: |  |
Total outside the United States |  |
All Other [Member] | United States [Member] |  |
Revenue from External Customer [Line Items] |  |
Revenues, Total |  | 685
Outside the United States: |  |
Total outside the United States |  |
All Other [Member] | United Kingdom [Member] |  |
Outside the United States: |  |
Total outside the United States |  |
All Other [Member] | Netherlands [Member] |  |
Outside the United States: |  |
Total outside the United States |  |
All Other [Member] | Other [Member] |  |
Outside the United States: |  |
Total outside the United States |  |

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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8933-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 + Details
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