Cash and Cash Equivalents and Investments (Details) (USD $) In Thousands, unless otherwise specified	Sep. 28, 2014	Mar. 30, 2014
Total [Member] | Cash [Member]
Assets:
Cash/Certificates of deposit/Money market securities	$ 26,701	$ 33,486
Total [Member] | Certificates of deposit [Member]
Assets:
Cash/Certificates of deposit/Money market securities	30,602	24,437
Total [Member] | Municipal bonds [Member]
Assets:
Cash/Certificates of deposit/Money market securities	4,297	5,258
Level 1 [Member] | Cash [Member]
Assets:
Cash/Certificates of deposit/Money market securities	26,701	33,486
Level 1 [Member] | Certificates of deposit [Member]
Assets:
Cash/Certificates of deposit/Money market securities	0	0
Level 2 [Member] | Certificates of deposit [Member]
Assets:
Cash/Certificates of deposit/Money market securities	30,602	24,437
Level 2 [Member] | Municipal bonds [Member]
Assets:
Cash/Certificates of deposit/Money market securities	4,297	5,258
Level 3 [Member] | Cash [Member]
Assets:
Cash/Certificates of deposit/Money market securities	0	0
Level 3 [Member] | Certificates of deposit [Member]
Assets:
Cash/Certificates of deposit/Money market securities	0	0
Level 3 [Member] | Municipal bonds [Member]
Assets:
Cash/Certificates of deposit/Money market securities	$ 0	$ 0