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Inventory (table) (detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2011
Inventory Disclosure [Abstract]      
Finished products $ 445,278 $ 406,164 $ 390,754
In process 18,107 24,451 21,680
Raw material and supplies 149,359 139,045 132,690
Total 612,744 569,660 545,124
Inventory, LIFO Reserve 133,014 137,227 89,888
Total Inventories $ 479,730 $ 432,433 $ 455,236