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Accrued Expenses and Other Current Liabilities - Product Warranty Rollforward (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jan. 31, 2017 | Jan. 31, 2017 | Jan. 31, 2016
Business Acquisition [Line Items] |  |  |
Minimum coverage period of product warranty from the date of shipment |  | 1 year |
Changes in Product Warranty Liability |  |  |
Accrued warranty obligations, as of the beginning of the period |  | $ 15,362,000 | $ 8,638,000
Provision for warranty obligations |  | 3,234,000 | 2,096,000
Adjustment to TCS pre-acquisition contingent liability |  | 4,200,000 | 0
Charges incurred |  | (3,782,000) | (2,110,000)
Accrued warranty obligations, as of the end of the period | $ 19,014,000 | 19,014,000 | $ 8,624,000
TCS's 911 call handling software [Member] | TeleCommunication Systems Inc. |  |  |
Changes in Product Warranty Liability |  |  |
Adjustment to TCS pre-acquisition contingent liability | 4,200,000 |  |
Accrued warranty obligations, as of the end of the period | $ 10,595,000 | $ 10,595,000 |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of increase in the standard and extended product warranty accrual from a business acquisition. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249 + Details
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- Definition Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers. For classified balance sheets, represents the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 25 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=68070138&loc=d3e11281-110244 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=68068213&loc=d3e12524-110249 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of decrease in the standard and extended product warranty accrual from payments made in cash or in kind to satisfy claims under the terms of the standard and extended product warranty. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph ((c)(2)) -URI http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249 + Details
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- Definition Amount of increase in the standard and extended product warranty accrual from warranties issued. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph ((c)(3)) -URI http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249 + Details
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