Derivatives and Hedging (Tables)

3 Months Ended

Jun. 30, 2013

Derivatives And Hedging Disclosure [Abstract]

Derivative Instruments not Designated as Hedging Instruments

	June 30, 2013				March 31, 2013
	Assets		Liabilities		Assets		Liabilities
Currency forward contracts	$	1,678	$	1,443	$	1,496	$	101
Futures contracts	2,222		351		443		680
Total	$	3,900	$	1,794	$	1,939	$	781

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

		Three months ended June 30,
		2013					2012
	Income Statement Classification	Gains		Losses			Gains		Losses
Currency forward contracts for:
Operating activities	Other expense	$	641	$	(1,778	)	$	1,400	$	(373	)
Seed capital investments	Other non-operating income (expense)	721		(924		)	287		(30		)
Futures contracts	Other non-operating income (expense)	2,813		(3,406		)	1,014		(541		)
Total		$	4,175	$	(6,108	)	$	2,701	$	(944	)