Consolidated Balance Sheets (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Current Assets
Cash	$ 69,561	$ 86,386
Trade receivables, less allowances for doubtful accounts of $31,757 and $28,650 at March 31, 2014 and 2013, respectively	701,060	710,740
Inventories, net (Note 4)	478,149	474,821
Deferred income tax asset, net (Note 5)	57,961	53,562
Prepaid expenses and other current assets	92,356	138,321
Total current assets	1,399,087	1,463,830
Plant and equipment at cost (Note 6)	4,931,064	4,585,933
Less accumulated depreciation	(2,128,649)	(1,899,628)
Plant and equipment, net	2,802,415	2,686,305
Goodwill (Note 7)	1,289,896	1,195,613
Other intangible assets, net (Note 7)	258,836	226,824
Other non-current assets	43,080	45,653
Total assets	5,793,314	5,618,225
Current Liabilities
Accounts payable, trade	196,911	183,258
Accrued expenses and other current liabilities (Note 8)	345,676	374,883
Short-term debt (Note 9)	387,866	0
Current portion of long-term debt (Note 9)	400,322	303,573
Total current liabilities	1,330,775	861,714
Long-term debt, excluding current portion (Note 9)	1,706,774	2,304,245
Deferred income tax liability, net (Note 5)	825,897	825,612
Other non-current liabilities	89,219	89,671
Commitments and contingencies (Notes 16 and 17)
Stockholders' Equity (Note 12)
Preferred stock, 20,030 shares authorized, no shares issued or outstanding at March 31, 2014 and 2013	0	0
Common stock, par value $0.01 per share, 200,000 shares authorized, 87,353 and 87,135 shares issued at March 31, 2014 and 2013, respectively	874	871
Capital in excess of par value	789,789	729,850
Retained earnings	2,047,843	1,861,395
Accumulated other comprehensive income	529	4,438
Treasury stock, 13,264 and 14,077 shares at cost at March 31, 2014 and 2013, respectively	(998,386)	(1,059,571)
Total stockholders' equity	1,840,649	1,536,983
Total liabilities and stockholders’ equity	5,793,314	5,618,225
Allowance for doubtful accounts receivable, current	$ 31,757	$ 28,650
Preferred stock, shares authorized	20,030,000	20,030,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares, issued	87,353,000	87,135,000
Treasury stock, shares	13,264,000	14,077,000