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Inventory (table) (detail) - USD ($) $ in Thousands | Mar. 31, 2017 | Mar. 31, 2016 | Mar. 31, 2015
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Inventory Disclosure [Abstract] |  |  |
Finished products | $ 534,995 | $ 467,337 | $ 414,154
In process | 35,982 | 25,855 | 22,651
Raw material and supplies | 160,333 | 213,790 | 199,674
Total | 731,310 | 706,982 | 636,479
Inventory, LIFO Reserve | 133,254 | 139,275 | 164,067
Total Inventories | $ 598,056 | $ 567,707 | $ 472,412

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