The Company and Summary of Significant Accounting Policies - Options Excluded from Computation of Earnings Per Share (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended	3 Months Ended		12 Months Ended
	Mar. 31, 2015 segment	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2012	Dec. 31, 2013
Derivative Instruments and Hedging Activities
Maximum maturity period of foreign currency forward or option contracts (in months)	15 months
Business Segment Reporting
Number of reportable business segments	6
Cash Equivalents
Money market funds	$ 127,900	143,816			$ 154,105
Nonvested stock units issued (NSUs)
Options excluded in the computation of diluted income per share
Options excluded in the computation of diluted income per share (in shares)	0	331	0	200
Restricted Stock Units (RSUs)
Options excluded in the computation of diluted income per share
Options excluded in the computation of diluted income per share (in shares)	624	729	795	671
Restricted Stock Awards (RSAs)
Options excluded in the computation of diluted income per share
Options excluded in the computation of diluted income per share (in shares)	0	6	0	0
Stock Appreciation Rights (SARs)
Options excluded in the computation of diluted income per share
Options excluded in the computation of diluted income per share (in shares)	525	730	525	525