Commitments and Contingencies (Potential for Future Brazilian State Tax Assessment) - Additional Information (Detail)	12 Months Ended
	Mar. 31, 2014 Y
Commitments and Contingencies Disclosure [Line Items]
Number of competitors notified	2
Statute of limitations, years	5
Maximum, Prior To December 31, 2010
Commitments and Contingencies Disclosure [Line Items]
Import tax, percentage	16.00%
Maximum, After December 31, 2010
Commitments and Contingencies Disclosure [Line Items]
Import tax, percentage	3.00%