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Estimated Purchase Price Allocation Based on Fair Value of Net Assets Acquired (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Jul. 31, 2014
Apr. 30, 2014
Jan. 31, 2014
Jul. 31, 2014
Business Acquisition [Line Items]        
Cash $ 18,024     $ 18,024
Accounts receivable 51,069     51,069
Inventory 41,642     41,642
Property, plant and equipment 22,859     22,859
Identifiable intangible assets       12,000
Other assets 3,410     3,410
Assets acquired: 149,004     149,004
Liabilities (32,260)     (32,260)
Deferred taxes (2,114)     (2,114)
Adjusted net assets acquired       114,630
Purchase price       (106,009)
Bargain purchase gain $ 4,000 $ (1,400) $ 8,621 $ 8,621