Summary Of Accounting Policies (Schedule Of Goodwill) (Details) (USD $)	6 Months Ended
	Sep. 30, 2011
Summary Of Accounting Policies [Abstract]
Balance, beginning of the year	$ 93,207,000
Acquisitions	8,607,000	[1]
Purchase accounting adjustments	280,000	[2]
Foreign currency translation adjustments	(434,000)
Balance, end of the quarter	101,660,000
Aggregate cash paid for acquisition	$ 21,400,000

[1] The amount is attributable to certain acquisitions that were not individually, nor in the aggregate, significant to the Company. The aggregate cash paid for these acquisitions was approximately $21.4 million, net of cash acquired.

[2] The amount is attributable to purchase accounting adjustments for a historical acquisition that was not significant to the Company. The adjustments are based on management's estimates from review of the valuation of assets and liabilities completed in a period subsequent to the respective acquisition.. The effects of the adjustments, had they been made at time of acquisition, would not have had a significant impact on the balance sheet, statement of operations, or statement of cash flows for the periods subsequent to that date.