Annual report pursuant to Section 13 and 15(d)

Consolidated Balance Sheet Detail - Property and Equipment, Net (Parenthetical) (Detail)

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Consolidated Balance Sheet Detail - Property and Equipment, Net (Parenthetical) (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Jan. 31, 2013
Balance Sheet Related Disclosures [Abstract]  
Write off of fully depreciated assets $ 42.8