Valuation and Qualifying Accounts (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 02, 2015		Jan. 03, 2014		Dec. 28, 2012
Allowance For Bad Debt [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year	$ 942		$ 933		$ 819
Provision Charged to Expense	264		515		483
Provision Charged to Revenues	0		0		0
Accounts Written-off Net of Recoveries	(190)	[1]	(506)	[1]	(369)	[1]
Balance at End of Year	1,016		942		933
Allowance For Contract Losses [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year	1,829		1,733		1,520
Provision Charged to Expense	0		0		0
Provision Charged to Revenues	1,454		1,189		1,280
Accounts Written-off Net of Recoveries	(913)	[1]	(1,093)	[1]	(1,067)	[1]
Balance at End of Year	$ 2,370		$ 1,829		$ 1,733

[1] Balance includes currency translation adjustments.