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Basis of Presentation - Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Feb. 28, 2015
May 31, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Raw materials $ 14,778us-gaap_InventoryRawMaterialsNetOfReserves $ 17,984us-gaap_InventoryRawMaterialsNetOfReserves
Work in process 14,665us-gaap_InventoryWorkInProcessNetOfReserves 14,304us-gaap_InventoryWorkInProcessNetOfReserves
Finished goods 205,198us-gaap_InventoryFinishedGoodsNetOfReserves 218,951us-gaap_InventoryFinishedGoodsNetOfReserves
Inventories, net $ 234,641us-gaap_InventoryNet $ 251,239us-gaap_InventoryNet