Derivative Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	Sep. 29, 2012	Mar. 31, 2012
Forward currency exchange contracts outstanding
Notional amount of foreign currency derivatives	$ 141,630	$ 146,661
Singapore Dollar [Member]
Forward currency exchange contracts outstanding
Notional amount of foreign currency derivatives	60,969	60,925
Euro [Member]
Forward currency exchange contracts outstanding
Notional amount of foreign currency derivatives	35,774	41,467
Indian Rupee [Member]
Forward currency exchange contracts outstanding
Notional amount of foreign currency derivatives	19,725	18,943
British Pound [Member]
Forward currency exchange contracts outstanding
Notional amount of foreign currency derivatives	13,136	14,250
Japanese Yen [Member]
Forward currency exchange contracts outstanding
Notional amount of foreign currency derivatives	$ 12,026	$ 11,076