Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Mar. 31, 2011
Current Assets
Cash	$ 45,790	$ 57,218
Trade receivables, less allowances for doubtful accounts of $30,624 and $23,655 at December 31, 2011 and March 31, 2011, respectively	595,518	550,262
Inventories, net	393,363	362,502
Deferred income tax asset, net	53,954	50,132
Prepaid expenses and other current assets	114,026	100,531
Total current assets	1,202,651	1,120,645
Plant and equipment at cost	4,198,908	3,949,974
Less accumulated depreciation	(1,636,206)	(1,494,216)
Plant and equipment, net	2,562,702	2,455,758
Goodwill	1,141,160	1,117,336
Other intangible assets, net	199,578	197,168
Other non-current assets	52,549	44,974
Total assets	5,158,640	4,935,881
Current Liabilities
Accounts payable, trade	152,211	163,091
Accrued expenses and other current liabilities	338,779	391,544
Short-term debt	406,861	0
Current portion of long-term debt	10,743	9,868
Total current liabilities	908,594	564,503
Long-term debt, excluding current portion	1,760,065	1,842,994
Deferred income tax liability, net	763,263	722,954
Other non-current liabilities	77,578	70,548
Commitments and contingencies
Stockholders' Equity
Preferred stock, 20,030 shares authorized, no shares issued or outstanding at December 31, 2011 and March 31, 2011	0	0
Common stock, par value $0.01 per share, 200,000 shares authorized, 86,801 and 86,591 shares issued at December 31, 2011 and March 31, 2011, respectively	868	866
Capital in excess of par value	634,801	607,593
Retained earnings	1,641,745	1,498,728
Accumulated other comprehensive income	2,801	7,580
Treasury stock, 10,611 and 6,995 shares at cost at December 31, 2011 and March 31, 2011, respectively	(631,075)	(379,885)
Total stockholders' equity	1,649,140	1,734,882
Total liabilities and stockholders' equity	$ 5,158,640	$ 4,935,881