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Goodwill and Intangible Assets - Intangible Assets (Detail) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Nov. 30, 2015
May. 31, 2015
Finite-Lived Intangible Assets [Line Items]    
Gross carrying value, excluding goodwill $ 275,670 $ 276,105
Accumulated amortization (103,159) (94,299)
Net carrying value, excluding goodwill 172,511 181,806
Product Technologies [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying value, finite intangible items 148,390 148,776
Accumulated amortization (46,355) (41,447)
Net carrying value, finite intangible items $ 102,035 $ 107,329
Weighted avg useful life 10 years 2 months 12 days 10 years 2 months 12 days
Customer Relationships [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying value, finite intangible items $ 86,322 $ 86,371
Accumulated amortization (44,895) (42,813)
Net carrying value, finite intangible items $ 41,427 $ 43,558
Weighted avg useful life 12 years 12 years
Trademark NAMIC [Member]    
Finite-Lived Intangible Assets [Line Items]    
Weighted avg useful life 10 years 8 months 12 days 10 years 8 months 12 days
Licenses [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying value, finite intangible items $ 3,600 $ 3,600
Accumulated amortization 0 0
Net carrying value, finite intangible items 3,600 3,600
Trademarks [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying value, finite intangible items 7,913 7,913
Accumulated amortization (6,313) (5,910)
Net carrying value, finite intangible items $ 1,600 $ 2,003
Weighted avg useful life 7 years 7 months 12 days 8 years 3 months 12 days
Distributor Relationships [Member]    
Finite-Lived Intangible Assets [Line Items]    
Weighted avg useful life 3 years 3 years
Research and Development [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying value, indefinite items $ 900 $ 900
Accumulated amortization (900) (900)
Net carrying value, indefinite items 0 0
Trademark NAMIC [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying value, indefinite items 28,545 28,545
Accumulated amortization (4,696) (3,229)
Net carrying value, indefinite items $ 23,849 $ 25,316