Condensed Consolidating Financial Statements (Details 4) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Sources (uses) of cash and cash equivalents
Net cash provided by (used in) operating activities	$ (41,622)	$ 71,903
Investing activities:
Capital expenditures	(38,349)	(31,793)
Change in restricted cash	(24,000)
Acquisition, net of cash received		(11,584)
Net cash used in investing activities	(62,349)	(43,377)
Financing activities:
Proceeds from issuance of debt	39,825
Deferred acquisition payments	(6,617)
Payments of long-term debt	(1,901)	(40,581)
Net payments under other credit facilities		(3,153)
Proceeds from exercise of stock options	58	225
Debt issuance costs	(275)	(36)
Net cash provided by (used in) financing activities	31,090	(43,545)
Net decrease in cash and cash equivalents	(72,881)	(15,019)
Effect of foreign currency fluctuations on cash	(81)	(983)
Cash and cash equivalents at beginning of fiscal period	210,521	152,051
Cash and cash equivalents at end of fiscal period	137,559	136,049
Parent
Sources (uses) of cash and cash equivalents
Net cash provided by (used in) operating activities	(33,506)	40,743
Investing activities:
Capital expenditures		(1)
Net cash used in investing activities		(1)
Financing activities:
Proceeds from issuance of debt	39,825
Deferred acquisition payments	(5,617)
Payments of long-term debt		(40,581)
Proceeds from exercise of stock options	58	225
Debt issuance costs	(275)
Net cash provided by (used in) financing activities	33,991	(40,356)
Net decrease in cash and cash equivalents	485	386
Cash and cash equivalents at beginning of fiscal period	7,933	6,417
Cash and cash equivalents at end of fiscal period	8,418	6,803
Guarantor Subsidiaries
Sources (uses) of cash and cash equivalents
Net cash provided by (used in) operating activities	(45,166)	9,764
Investing activities:
Capital expenditures	(13,395)	(17,903)
Change in restricted cash	(24,000)
Acquisition, net of cash received		(11,584)
Net cash used in investing activities	(37,395)	(29,487)
Financing activities:
Deferred acquisition payments	(1,000)
Debt issuance costs		(36)
Net cash provided by (used in) financing activities	(1,000)	(36)
Net decrease in cash and cash equivalents	(83,561)	(19,759)
Cash and cash equivalents at beginning of fiscal period	178,205	119,326
Cash and cash equivalents at end of fiscal period	94,644	99,567
Non-Guarantor Subsidiaries
Sources (uses) of cash and cash equivalents
Net cash provided by (used in) operating activities	37,050	21,396
Investing activities:
Capital expenditures	(24,954)	(13,889)
Net cash used in investing activities	(24,954)	(13,889)
Financing activities:
Payments of long-term debt	(1,901)
Net payments under other credit facilities		(3,153)
Net cash provided by (used in) financing activities	(1,901)	(3,153)
Net decrease in cash and cash equivalents	10,195	4,354
Effect of foreign currency fluctuations on cash	(81)	(983)
Cash and cash equivalents at beginning of fiscal period	24,383	26,308
Cash and cash equivalents at end of fiscal period	$ 34,497	$ 29,679