Derivatives and Hedging (Tables)

12 Months Ended

Mar. 31, 2013

Derivatives And Hedging Disclosure [Abstract]

Derivative Instruments not Designated as Hedging Instruments

	2013				2012
	Assets		Liabilities		Assets		Liabilities
Currency forward contracts	$	1,496	$	101	$	38	$	685
Futures contracts	443		680		46		201
Total	$	1,939	$	781	$	84	$	886

Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance

		2013					2012					2011
	Income Statement Classification	Gains		Losses			Gains		Losses			Gains		Losses
Currency forward contracts for:
Operating activities	Other expense	$	3,650	$	(1,858	)	$	5,604	$	(3,159	)	$	4,943	$	(6,094	)
Seed capital investments	Other non-operating income (expense)	1,090		(380		)	431		(351		)	123		(355		)
Futures contracts for seed capital investments	Other non-operating income (expense)	1,914		(5,597		)	5,684		(4,560		)	1,652		(7,146		)
Total		$	6,654	$	(7,835	)	$	11,719	$	(8,070	)	$	6,718	$	(13,595	)