Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified	Mar. 30, 2013
Fair value measurement
Total	$ 95,530
Time deposits [Member]
Fair value measurement
Total	16,448
US Treasury Securities [Member]
Fair value measurement
Total	374
National government and agency securities [Member]
Fair value measurement
Total	5,320
State and municipal bond obligations [Member]
Fair value measurement
Total	3,193
Corporate bonds and notes [Member]
Fair value measurement
Total	51,125
Asset backed Securities [Member]
Fair value measurement
Total	10,832
Mortgage backed securities [Member]
Fair value measurement
Total	8,238
Level 1 [Member]
Fair value measurement
Total	374
Level 1 [Member] | Time deposits [Member]
Fair value measurement
Total
Level 1 [Member] | US Treasury Securities [Member]
Fair value measurement
Total	374
Level 1 [Member] | National government and agency securities [Member]
Fair value measurement
Total
Level 1 [Member] | State and municipal bond obligations [Member]
Fair value measurement
Total
Level 1 [Member] | Corporate bonds and notes [Member]
Fair value measurement
Total
Level 1 [Member] | Asset backed Securities [Member]
Fair value measurement
Total
Level 1 [Member] | Mortgage backed securities [Member]
Fair value measurement
Total
Level 2 [Member]
Fair value measurement
Total	95,156
Level 2 [Member] | Time deposits [Member]
Fair value measurement
Total	16,448
Level 2 [Member] | US Treasury Securities [Member]
Fair value measurement
Total
Level 2 [Member] | National government and agency securities [Member]
Fair value measurement
Total	5,320
Level 2 [Member] | State and municipal bond obligations [Member]
Fair value measurement
Total	3,193
Level 2 [Member] | Corporate bonds and notes [Member]
Fair value measurement
Total	51,125
Level 2 [Member] | Asset backed Securities [Member]
Fair value measurement
Total	10,832
Level 2 [Member] | Mortgage backed securities [Member]
Fair value measurement
Total	8,238
Level 3 [Member]
Fair value measurement
Total
Level 3 [Member] | Time deposits [Member]
Fair value measurement
Total
Level 3 [Member] | US Treasury Securities [Member]
Fair value measurement
Total
Level 3 [Member] | National government and agency securities [Member]
Fair value measurement
Total
Level 3 [Member] | State and municipal bond obligations [Member]
Fair value measurement
Total
Level 3 [Member] | Corporate bonds and notes [Member]
Fair value measurement
Total
Level 3 [Member] | Asset backed Securities [Member]
Fair value measurement
Total
Level 3 [Member] | Mortgage backed securities [Member]
Fair value measurement
Total