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DERIVATIVE INSTRUMENTS - Additional Information (Detail) (Energy Hedges, USD $) In Millions, unless otherwise specified	Mar. 31, 2012
Energy Hedges
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Fair value derivative asset	$ 5

Fair value of derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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