Debt - Additional Information (Detail) (USD $)	6 Months Ended			3 Months Ended		6 Months Ended			3 Months Ended		3 Months Ended	6 Months Ended					1 Months Ended							1 Months Ended						1 Months Ended				3 Months Ended		6 Months Ended		1 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended
	Sep. 30, 2011	Sep. 28, 2012	Mar. 31, 2012	Sep. 28, 2012 Bank Term Loan	Sep. 30, 2011 Bank Term Loan	Sep. 28, 2012 Bank Term Loan	Sep. 30, 2011 Bank Term Loan	Sep. 25, 2008 Private Bank Loan Agreement	Jun. 29, 2012 Private Bank Loan Agreement Bank Term Loan	Sep. 23, 2011 Private Bank Loan Agreement Bank Term Loan	Jun. 29, 2012 Private Bank Loan Agreement Line of Credit	Sep. 28, 2012 Silicon Valley Loan Agreement	Jan. 31, 2012 Silicon Valley Loan Agreement	Oct. 25, 2012 Silicon Valley Loan Agreement Subsequent Event	Oct. 25, 2012 Silicon Valley Loan Agreement Minimum Subsequent Event	Oct. 25, 2012 Silicon Valley Loan Agreement Maximum Subsequent Event	Jan. 31, 2012 Silicon Valley Loan Agreement Period One	Oct. 25, 2012 Silicon Valley Loan Agreement Period One Subsequent Event	Jan. 31, 2012 Silicon Valley Loan Agreement Period Two	Oct. 25, 2012 Silicon Valley Loan Agreement Period Two Subsequent Event	Jan. 31, 2012 Silicon Valley Loan Agreement Before First Anniversary of Term Loan	Jan. 31, 2012 Silicon Valley Loan Agreement After First but Before Second Anniversary of Term Loan	Jan. 31, 2012 Silicon Valley Loan Agreement After Second Anniversary of Term Loan	Jan. 31, 2012 Silicon Valley Loan Agreement Bank Term Loan	Jan. 31, 2012 Silicon Valley Loan Agreement Bank Term Loan Minimum	Oct. 25, 2012 Silicon Valley Loan Agreement Bank Term Loan Minimum Subsequent Event	Jan. 31, 2012 Silicon Valley Loan Agreement Bank Term Loan Maximum	Oct. 25, 2012 Silicon Valley Loan Agreement Bank Term Loan Maximum Subsequent Event	Jan. 31, 2012 Silicon Valley Loan Agreement Export Import Sublimit	Jan. 31, 2012 Silicon Valley Loan Agreement Export Import Sublimit Minimum	Oct. 25, 2012 Silicon Valley Loan Agreement Export Import Sublimit Minimum Subsequent Event	Jan. 31, 2012 Silicon Valley Loan Agreement Export Import Sublimit Maximum	Oct. 25, 2012 Silicon Valley Loan Agreement Export Import Sublimit Maximum Subsequent Event	Sep. 28, 2012 Michigan Economic Development Corporation Loan Agreement	Sep. 30, 2011 Michigan Economic Development Corporation Loan Agreement	Sep. 28, 2012 Michigan Economic Development Corporation Loan Agreement	Sep. 30, 2011 Michigan Economic Development Corporation Loan Agreement	Nov. 29, 2010 Picometrix Notes Robin Risser, COO,and Steve Williamson, CTO	Dec. 31, 2005 Picometrix Notes Robin Risser, COO,and Steve Williamson, CTO	Sep. 28, 2012 Picometrix Notes Robin Risser, COO,and Steve Williamson, CTO	Sep. 30, 2011 Picometrix Notes Robin Risser, COO,and Steve Williamson, CTO	Sep. 28, 2012 Picometrix Notes Robin Risser, COO,and Steve Williamson, CTO	Sep. 30, 2011 Picometrix Notes Robin Risser, COO,and Steve Williamson, CTO	Jun. 29, 2012 Michigan Economic Development Corporation Loan Agreement One	Jun. 29, 2012 Michigan Economic Development Corporation Loan Agreement Two
Debt Instrument [Line Items]
Line of credit								$ 3,000,000					$ 5,000,000	$ 750,000															$ 3,000,000
Bank term loan		833,000	1,000,000							1,000,000														1,000,000
Monthly principal payments of term loan									20,833
Additional interest above prime rate									0.50%		0.50%														1.00%	4.25%	4.25%	4.50%		0.50%	3.75%	3.75%	4.00%					2.00%	1.00%
Debt instrument maturity date									Oct. 01, 2015		Sep. 25, 2014																											Sep. 01, 2012
Adjusted EBITDA																	(1,250,000)	1,000,000	1	1
Liquidity ratio													2.25		2.00	2.25
Loan payment period																								3 years
Percentage of prepayment premium over amount outstanding																					1.00%	0.50%	0.25%
Percentage of termination fee on amount outstanding													1.00%
Line of credit, additional borrowing capacity												2,800,000		500,000
Interest rate on loan												5.75%		6.75%																														4.00%	4.00%
Interest rate on line of credit												5.25%		6.25%
Line of credit outstanding												800,000
Term of the SVB loan agreement												3 years
Line of credit facility term												2 years
Interest payments during a period				14,000	9,000	30,000	29,000																											13,000	12,000	28,000	38,000			0	15,000	0	31,000
Maturity period for principal and accrued interest																																												2014-11	2014-09
Aggregate principal amount																																						1,400,500	2,900,500
Debt restructuring fee																																						156,312
Percentage of debt restructuring fee																																						11.00%
Payments to note holders	$ 450,000																																									$ 728,735