Note 12 - Stock-based Compensation (Details) - Summary of Stock Option Transactions - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended	12 Months Ended
	Sep. 27, 2015	Mar. 29, 2015
Summary of Stock Option Transactions [Abstract]
Balance at March 29, 2015		7,609,622
Balance at March 29, 2015 (in Dollars per share)		$ 8.77
Balance at March 29, 2015	4 years 233 days	4 years 313 days
Balance at March 29, 2015 (in Dollars)		$ 14,377
Balance at March 29, 2015		2,850,000
Balance at September 27, 2015	7,772,082
Balance at September 27, 2015 (in Dollars per share)	$ 8.51
Balance at September 27, 2015	4 years 233 days	4 years 313 days
Balance at September 27, 2015 (in Dollars)	$ 306
Balance at September 27, 2015	442,000
Granted	885,500
Granted (in Dollars per share)	$ 6.36
Exercised	(201,767)
Exercised (in Dollars per share)	$ 6.75
Cancelled	(135,253)
Cancelled (in Dollars per share)	$ 8.05
Forfeited	(386,020)
Forfeited (in Dollars per share)	$ 9.72
Vested and expected to vest, September 27, 2015	7,227,691
Vested and expected to vest, September 27, 2015 (in Dollars per share)	$ 8.50
Vested and expected to vest, September 27, 2015	4 years 197 days
Vested and expected to vest, September 27, 2015 (in Dollars)	$ 282
Vested and exercisable, September 27, 2015	3,872,013
Vested and exercisable, September 27, 2015 (in Dollars per share)	$ 8.04
Vested and exercisable, September 27, 2015	3 years 233 days
Vested and exercisable, September 27, 2015 (in Dollars)	$ 193