Condensed Consolidated Statements of Cash Flows (USD $) In Thousands	6 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Operating activities:
Net income	$ 46,167	$ 14,812
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	23,011	28,642
Amortization of debt discount and debt issuance costs	2,056	2,754
Net (gain) loss on sales and disposals of assets	83	(1,435)
Stock-based compensation expense	2,175	482
Change in deferred income taxes	379	(418)
Change in operating assets	18,438	(39,109)
Change in operating liabilities	(42,517)	14,376
Other	1,197	(1,907)
Loss on early extinguishment of debt		38,248
Net cash provided by operating activities	50,989	56,445
Investing activities:
Capital expenditures	(20,105)	(13,821)
Acquisition, net of cash received	(11,584)
Proceeds from sales of assets		5,425
Net cash used in investing activities	(31,689)	(8,396)
Financing activities:
Change in restricted cash	(36,497)
Proceeds from issuance of debt		227,434
Payments of long-term debt	(4,084)	(228,543)
Net payments under other credit facilities	(3,153)	(1,779)
Proceeds from exercise of stock options	159
Debt issuance costs	(29)	(7,461)
Debt extinguishment costs		(207)
Net cash used in financing activities	(43,604)	(10,556)
Net increase (decrease) in cash and cash equivalents	(24,304)	37,493
Effect of foreign currency fluctuations on cash	(584)	762
Cash and cash equivalents at beginning of fiscal period	152,051	79,199
Cash and cash equivalents at end of fiscal period	$ 127,163	$ 117,454