Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	3 Months Ended		12 Months Ended
	Mar. 29, 2015	Mar. 30, 2014	Dec. 31, 2012
Significant Accounting Policies [Line Items]
Reporting period		89 days
Fair value measurements, transfers between Level 1 and Level 2	$ 0
Original maturity period of cash and cash equivalents	Three months or less
Fair value of cash and cash equivalents based on quoted market prices in active markets Level 1 valuation	500,000
Gain/(Loss) on disposal of discontinued operations, net of tax		(562,000)
Thermax and Raydex [Member]
Significant Accounting Policies [Line Items]
Cash proceeds from the sales of discontinued operations			265,600,000
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
Standby letters of credit [Member]
Significant Accounting Policies [Line Items]
Standby letters of credit, surety bonds and bank guaranties	7,500,000
Bank guaranties [Member]
Significant Accounting Policies [Line Items]
Standby letters of credit, surety bonds and bank guaranties	1,600,000
Surety bonds [Member]
Significant Accounting Policies [Line Items]
Standby letters of credit, surety bonds and bank guaranties	$ 1,800,000
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