Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2012		Mar. 31, 2011		Mar. 31, 2010	Mar. 31, 2009
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Business Combination, Contingent Consideration Arrangements, Basis for Amount	6892		4984		4984	0
Cash and Cash Equivalents, Fair Value Disclosure	$ 353		$ 359
Deferred Compensation Plan Assets, Fair Value	42,391		42,023
Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	150,821		193,016
Foreign Currency Contract, Asset, Fair Value Disclosure	0	[1]	0	[1]
Foreign Currency Contracts, Liability, Fair Value Disclosure	0	[1]	0	[1]
Investments, Fair Value Disclosure	3,032	[2]	2,493	[2]
Deferred Compensation Plan Assets, Fair Value	3,032	[2]	2,493	[2]
Long-term Debt, Fair Value	0	[3]	0	[3]
Business Acquisition, Contingent Consideration, at Fair Value	0		0
Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	0		0
Foreign Currency Contract, Asset, Fair Value Disclosure	12	[1]	1,483	[1]
Foreign Currency Contracts, Liability, Fair Value Disclosure	863	[1]	41	[1]
Investments, Fair Value Disclosure	0	[2]	0	[2]
Deferred Compensation Plan Assets, Fair Value	0	[2]	0	[2]
Long-term Debt, Fair Value	243,999	[3]	237,167	[3]
Business Acquisition, Contingent Consideration, at Fair Value	0		0
Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	0		0
Foreign Currency Contract, Asset, Fair Value Disclosure	0	[1]	0	[1]
Foreign Currency Contracts, Liability, Fair Value Disclosure	0	[1]	0	[1]
Investments, Fair Value Disclosure	0	[2]	0	[2]
Deferred Compensation Plan Assets, Fair Value	0	[2]	0	[2]
Long-term Debt, Fair Value	0	[3]	0	[3]
Business Acquisition, Contingent Consideration, at Fair Value			4,984
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	150,821		193,016
Foreign Currency Contract, Asset, Fair Value Disclosure	12	[1]	1,483	[1]
Foreign Currency Contracts, Liability, Fair Value Disclosure	863	[1]	41	[1]
Investments, Fair Value Disclosure	3,032	[2]	2,493	[2]
Deferred Compensation Plan Assets, Fair Value	3,032	[2]	2,493	[2]
Long-term Debt, Fair Value	210,000	[3]	210,000	[3]
Business Acquisition, Contingent Consideration, at Fair Value	6,892
Capital Additions [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability	4,484
Contingent consideration gain loss [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability	(2,454)
Foreign Currency Gain (Loss) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability	$ (122)

[1] The fair values of forward and swap contracts are based on period-end forward rates and reflect the value of the amount that we would pay or receive for the contracts involving the same notional amounts and maturity dates.

[2] We provide a domestic non-qualified deferred compensation plan covering certain employees, which formerly allowed for the deferral of compensation for an employee-specified term or until retirement or termination. Amounts deferred can be allocated to various hypothetical investment options. The Plan has been amended to disallow deferral elections of salary in respect of 2012 and subsequent calendar years and of commissions and other incentive compensation in respect fiscal year 2013 and subsequent periods. We hold investments, primarily comprised of mutual funds, to satisfy the future obligations of the plan. Changes in the value of the investment accounts are recognized each period based on the fair value of the underlying investments. Subject to plan terms, employees who made deferrals are entitled to receive distributions of their hypothetical account balances (amounts deferred, together with earnings (losses)).

[3] We estimate the fair value of our long-term debt using discounted cash flow analysis, based on our current incremental borrowing rates for similar types of borrowing arrangements.