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Goodwill and Acquired Intangible Assets (Details) (USD $)
3 Months Ended6 Months Ended
Sep. 30, 2011
Oct. 01, 2010
Sep. 30, 2011
Year
Month
Oct. 01, 2010
Current and expected amortization expense for acquired intangible assets    
For the six months ended September 30, 2011$ 4,767,000$ 5,094,000$ 9,539,000$ 9,704,000
Expected for the remainder of fiscal year 2012  9,179,000 
Expected for fiscal year 2013  15,555,000 
Expected for fiscal year 2014  13,811,000 
Expected for fiscal year 2015  13,735,000 
Expected for fiscal year 2016  10,181,000 
Thereafter  9,618,000 
Total future amortization expense  72,079,000 
Goodwill and Acquired Intangible Assets (Textuals) [Abstract]    
Change in goodwill related to foreign currency translation  200,000 
Other acquired intangible assets estimated useful lives, minimum  8 
Other acquired intangible assets estimated useful lives, maximum  10 
Amortization of acquired intangible assets$ 4,767,000$ 5,094,000$ 9,539,000$ 9,704,000