Quarterly report pursuant to Section 13 or 15(d)

Goodwill and Intangible Assets - Additional Information (Detail)

v2.4.1.9
Goodwill and Intangible Assets - Additional Information (Detail) (USD $)
3 Months Ended
Apr. 30, 2015
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill, Impairment charges $ 0us-gaap_GoodwillImpairmentLoss