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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 28, 2015 | Jun. 28, 2015 | Jun. 29, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2010 | Dec. 31, 2014
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Reporting period |  | 179 days | 180 days |  |  |  |
Fair value measurements, transfers between Level 1 and Level 2 | $ 0 | $ 0 | $ 0 |  |  |  |
Original maturity period of cash and cash equivalents |  |  |  |  |  |  |
Fair value of cash and cash equivalents based on quoted market prices in active markets Level 1 valuation | 2,500,000 | $ 2,500,000 |  |  |  |  |
Gain/(Loss) on disposal of discontinued operations, net of tax | (86,000) | (86,000) | (562,000) |  |  |  |
Receivables, net | 412,251,000 | 412,251,000 |  |  |  |  | $ 379,777,000
Thermax and Raydex [Member] |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Gain/(Loss) on disposal of discontinued operations, before tax |  |  | (900,000) |  | $ 211,600,000 |  |
Gain/(Loss) on disposal of discontinued operations, net of tax |  |  | $ (600,000) |  | 124,700,000 |  |
Cash proceeds from the sales of discontinued operations |  |  |  |  | $ 265,600,000 |  |
Trapeze [Member] |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Sale price for business |  |  |  |  |  | $ 152,100,000 |
Gain/(Loss) on disposal of discontinued operations, before tax | (200,000) | (200,000) |  |  |  | 88,300,000 |
Gain/(Loss) on disposal of discontinued operations, net of tax | (100,000) | (100,000) |  |  |  | 44,800,000 |
Cash proceeds from the sales of discontinued operations |  |  |  |  |  | 136,900,000 |
Amount in escrow as partial security for Company's indemnity obligations under transaction's purchase and sale agreement |  |  |  |  |  | $ 15,200,000 |
Receivables, net | 3,500,000 | 3,500,000 |  |  |  |  |
Partial settlement received from escrow |  |  |  | $ 4,200,000 |  |  |
Standby Letters of Credit [Member] |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Standby letters of credit, bank guaranties, and surety bonds | 7,900,000 | 7,900,000 |  |  |  |  |
Bank Guaranties [Member] |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Standby letters of credit, bank guaranties, and surety bonds | 3,500,000 | 3,500,000 |  |  |  |  |
Surety Bonds [Member] |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Standby letters of credit, bank guaranties, and surety bonds | $ 3,300,000 | $ 3,300,000 |  |  |  |  |
First Quarter Fiscal Year 2015 [Member] |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Reporting period |  | 88 days |  |  |  |  |
Guideline used to determine the end date of first quarter |  | 91 days |  |  |  |  |
Fiscal Second Quarter 2015 [Member] |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Reporting period |  | 91 days |  |  |  |  |
Fiscal Third Quarter 2015 [Member] |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Reporting period |  | 91 days |  |  |  |  |

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