Quarterly report pursuant to Section 13 or 15(d)

Goodwill and Intangible Assets - Additional Information (Detail)

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Goodwill and Intangible Assets - Additional Information (Detail)
3 Months Ended
Apr. 30, 2016
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill, Impairment charges $ 0