Inventory (table)

12 Months Ended

Mar. 31, 2017

Inventory Disclosure [Abstract]

Schedule of Inventory, Current [Table Text Block]

		2017		2016		2015
		(In thousands)
Finished products	$	534,995	$	467,337	$	414,154
In process		35,982		25,855		22,651
Raw materials and supplies		160,333		213,790		199,674
		731,310		706,982		636,479
Less excess of FIFO cost over LIFO cost		133,254		139,275		164,067
Total inventories	$	598,056	$	567,707	$	472,412