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Acquisitions - Summary of Business Acquisitions Purchase Price Allocation (Detail) - USD ($)
$ in Thousands
Jan. 31, 2016
Apr. 30, 2015
Dec. 11, 2014
Business Acquisition [Line Items]      
Goodwill $ 76,164 $ 75,426  
BTI Acquisition      
Business Acquisition [Line Items]      
Cash     $ 24
Accounts receivable     7,876
Inventories     12,817
Income tax receivable     114
Other current assets     563
Property, plant, and equipment     2,508
Intangibles     72,550
Goodwill     62,394
Total assets acquired     158,846
Accounts payable     1,649
Accrued expenses     409
Accrued payroll     904
Accrued taxes other than income     9
Deferred income taxes     20,414
Total liabilities assumed     23,385
Net assets acquired     135,461
BTI Acquisition | As Initially Reported      
Business Acquisition [Line Items]      
Cash     24
Accounts receivable     7,873
Inventories     12,819
Income tax receivable     393
Other current assets     563
Property, plant, and equipment     2,826
Intangibles     73,550
Goodwill     62,142
Total assets acquired     160,190
Accounts payable     1,647
Accrued expenses     326
Accrued payroll     904
Accrued taxes other than income     9
Deferred income taxes     21,128
Total liabilities assumed     24,014
Net assets acquired     136,176
BTI Acquisition | Measurement Period Adjustments      
Business Acquisition [Line Items]      
Accounts receivable     3
Inventories     (2)
Income tax receivable     (279)
Property, plant, and equipment     (318)
Intangibles     (1,000)
Goodwill     252
Total assets acquired     (1,344)
Accounts payable     2
Accrued expenses     83
Deferred income taxes     (714)
Total liabilities assumed     (629)
Net assets acquired     $ (715)