Condensed Consolidating Financial Statements (Details 4) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Sources (uses) of cash and cash equivalents
Net cash used in operating activities	$ (27,631)	$ (21,207)
Investing activities:
Capital expenditures	(15,481)	(13,101)
Change in restricted cash	1,591
Net cash used in investing activities	(13,890)	(13,101)
Financing activities:
Deferred acquisition payments	(1,204)	(1,439)
Proceeds from issuance of debt		15,825
Payments of long-term debt	(306)	(1,576)
Proceeds from exercise of stock options	19	41
Debt issuance costs		(275)
Net cash provided by (used in) financing activities	(1,491)	12,576
Net decrease in cash and cash equivalents	(43,012)	(21,732)
Effect of foreign currency fluctuations on cash	189	(943)
Cash and cash equivalents at beginning of fiscal period	95,978	210,521
Cash and cash equivalents at end of fiscal period	53,155	187,846
Parent
Sources (uses) of cash and cash equivalents
Net cash used in operating activities	(7,889)	(14,653)
Financing activities:
Deferred acquisition payments	(204)	(439)
Proceeds from issuance of debt		15,825
Payments of long-term debt	(306)
Proceeds from exercise of stock options	19	41
Debt issuance costs		(275)
Net cash provided by (used in) financing activities	(491)	15,152
Net decrease in cash and cash equivalents	(8,380)	499
Cash and cash equivalents at beginning of fiscal period	17,202	7,933
Cash and cash equivalents at end of fiscal period	8,822	8,432
Guarantor Subsidiaries
Sources (uses) of cash and cash equivalents
Net cash used in operating activities	(19,373)	(15,306)
Investing activities:
Capital expenditures	(7,186)	(3,660)
Change in restricted cash	1,591
Net cash used in investing activities	(5,595)	(3,660)
Financing activities:
Deferred acquisition payments	(1,000)	(1,000)
Net cash provided by (used in) financing activities	(1,000)	(1,000)
Net decrease in cash and cash equivalents	(25,968)	(19,966)
Cash and cash equivalents at beginning of fiscal period	52,056	178,205
Cash and cash equivalents at end of fiscal period	26,088	158,239
Non-Guarantor Subsidiaries
Sources (uses) of cash and cash equivalents
Net cash used in operating activities	(369)	8,752
Investing activities:
Capital expenditures	(8,295)	(9,441)
Net cash used in investing activities	(8,295)	(9,441)
Financing activities:
Payments of long-term debt		(1,576)
Net cash provided by (used in) financing activities		(1,576)
Net decrease in cash and cash equivalents	(8,664)	(2,265)
Effect of foreign currency fluctuations on cash	189	(943)
Cash and cash equivalents at beginning of fiscal period	26,720	24,383
Cash and cash equivalents at end of fiscal period	$ 18,245	$ 21,175