Quarterly report pursuant to Section 13 or 15(d)

Severance and Other Restructuring Costs - Additional Information (Detail)

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Severance and Other Restructuring Costs - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended 1 Months Ended
Oct. 31, 2014
Oct. 31, 2014
Oct. 31, 2014
CEO [Member]
Restructuring Cost and Reserve [Line Items]      
Severance and restructuring charges $ 1.2 $ 1.9 $ 1.2