Accrued Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 29, 2012	Sep. 29, 2012	Mar. 31, 2012	Dec. 31, 2011	Oct. 01, 2011	Apr. 02, 2011
Schedule of Accrued Liabilities
Payroll-related liabilities	$ 8,097		$ 6,446
Product warranty accrual	5,790	6,096	4,187	4,637	5,117	4,415
Pension benefit liabilities	2,049		2,110
Professional fees payable	1,907		2,011
Freight accrual	1,680		1,119
Income taxes payable	1,356		1,730
Purchase order commitments and receipts	847		1,473
Value added taxes payable	332		260
Customer deposits	272		385
Restructuring costs payable	10		1,048
Other	1,000		866
Accrued liabilities	$ 23,340		$ 21,635