Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Dec. 31, 2017	Mar. 31, 2017
Current assets:
Cash and cash equivalents	$ 284,166	$ 109,774
Accounts receivable, net	140,239	92,526
Inventories, net	201,091	147,955
Prepaid expenses and other (1)	38,551	28,782
Total current assets	664,047	379,037
Noncurrent Assets:
Property, plant and equipment, net of accumulated depreciation of $853,623 and $821,276 as of December 31, 2017 and March 31, 2017, respectively	374,719	209,311
Goodwill	40,294	40,294
Intangible assets, net	61,068	29,781
Investment in TOKIN	8,750	63,416
Deferred income taxes (1)	11,922	8,367
Other assets	10,987	4,119
Total assets	1,171,787	734,325
Current liabilities:
Current portion of long-term debt	20,359	2,000
Accounts payable	133,314	69,674
Accrued expenses	108,360	57,752
Income taxes payable	4,541	715
Total current liabilities	266,574	130,141
Liabilities, Noncurrent [Abstract]
Long-term debt, less current portion	307,803	386,211
Other non-current obligations	152,718	60,131
Deferred income taxes	6,694	3,370
Stockholders’ equity:
Preferred stock, par value $0.01, authorized 10,000 shares, none issued	0	0
Common stock, par value $0.01, authorized 175,000 shares, issued 56,595 and 46,689 shares at December 31, 2017 and March 31, 2017, respectively	566	467
Additional paid-in capital	460,087	447,671
Retained earnings (deficit) (1)	242	(251,854)
Accumulated other comprehensive income	(22,897)	(41,812)
Total stockholders’ equity	437,998	154,472
Total liabilities and stockholders’ equity	$ 1,171,787	$ 734,325