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Acquisitions (Details) - USD ($) |  |  | 1 Months Ended | 3 Months Ended |
--- | --- | --- | --- | --- | ---
Jul. 01, 2017 | Mar. 04, 2015 | Sep. 30, 2015 | Oct. 29, 2017 | Jul. 31, 2016 | Jan. 29, 2017
Business Acquisition [Line Items] |  |  |  |  |  |
Effective date of acquisition | Jul. 01, 2017 | Mar. 04, 2015 |  |  |  |
Name of acquired entity | AptoVision Technologies Inc. | Triune Systems, L.L.C. |  |  |  |
Goodwill |  |  |  | $ 341,890,000 |  | $ 329,703,000
AptoVision Technologies Inc. [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Cash paid to to acquire business | $ 17,600,000 |  |  |  |  |
Earn-out liability | 17,000,000 |  |  |  |  |
Goodwill | $ 12,187,000 |  |  | 12,187,000 |  |
Reduction of goodwill resulting from purchase price adjustment |  |  |  | 4,700,000 |  |
AptoVision Technologies Inc. [Member] | Earn-out Payable Within First Three Fiscal Years Of Acquisition Date [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Period over which contingent consideration will be paid | 3 years |  |  |  |  |
Triune Systems [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Cash paid to to acquire business |  | $ 35,000,000 | $ 9,500,000 |  | $ 500,000 |
Earn-out liability |  |  |  | 0 |  | $ 0
Guaranteed minimum purchase price |  | 45,000,000 |  |  |  |
Additional cash consideration |  | 10,000,000 |  |  |  |
Triune Systems [Member] | Earn-out Payable Within First Three Fiscal Years Of Acquisition Date [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Potential payments under earn-out arrangements, high estimate |  | $ 70,000,000 |  |  |  |
Period over which contingent consideration will be paid |  | 3 years |  |  |  |
Triune Systems [Member] | Additional Earn-out Payable After Third Fiscal Year From Acquisition Date [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Potential payments under earn-out arrangements, high estimate |  | $ 16,000,000 |  |  |  |
Maximum [Member] | AptoVision Technologies Inc. [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Potential payments under earn-out arrangements, high estimate | $ 47,000,000 |  |  |  |  |
Maximum [Member] | AptoVision Technologies Inc. [Member] | Earn-out Payable Within First Three Fiscal Years Of Acquisition Date [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Potential payments under earn-out arrangements, high estimate | 47,000,000 |  |  |  |  |
Accrued Liabilities [Member] | AptoVision Technologies Inc. [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Earn-out liability | 8,500,000 |  |  |  |  |
Other long-term liabilities [Member] | AptoVision Technologies Inc. [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Earn-out liability | $ 8,500,000 |  |  |  |  |
Selling, General and Administrative Expenses [Member] | AptoVision Technologies Inc. [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquisition related transaction costs incurred during the period |  |  |  | $ 1,600,000 |  |

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