Summary Financial Information (OCI Statement) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011
Net income (loss)	$ 9,579	$ 8,515	$ 26,267	$ 17,970
Change in derivatives qualifying as hedges, net of deferred tax expense of $(3), $17, $(3), and $154	(138)	(36)	326	36
Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent [Abstract]
Foreign currency translation adjustments	2,604	(3,597)	40	(8,047)
Adjustments [Abstract]
Unrealized holding gain (loss) arising during the period, net of deferred taxes of $0 for all periods	194	610	(489)	198
Reclassification adjustment for gain included in net income, net of deferred tax expense of $0 for all periods	(253)	32	(400)	157
Total Adjustments	(59)	642	89	355
Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent	2,407	(2,991)	277	(7,656)
Comprehensive Income Net Of Tax	11,986	5,524	(25,990)	10,314
Parent Company [Member]
Net income (loss)	9,579	8,515	26,267	17,970
Change in derivatives qualifying as hedges, net of deferred tax expense of $(3), $17, $(3), and $154	(161)	(82)	(118)	(10)
Adjustments [Abstract]
Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent	(161)	(82)	(118)	(10)
Comprehensive Income Net Of Tax	9,418	8,433	26,149	17,960
Guarantor Subsidiaries [Member]
Net income (loss)	2,345	(768)	3,797	329
Adjustments [Abstract]
Comprehensive Income Net Of Tax	2,345	(768)	3,797	329
Non-Guarantor Subsidiaries [Member]
Net income (loss)	1,547	3,799	10,354	10,305
Change in derivatives qualifying as hedges, net of deferred tax expense of $(3), $17, $(3), and $154	23		(208)
Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent [Abstract]
Foreign currency translation adjustments	2,604	(3,597)	(40)	(8,047)
Adjustments [Abstract]
Unrealized holding gain (loss) arising during the period, net of deferred taxes of $0 for all periods	194	610	(489)	198
Reclassification adjustment for gain included in net income, net of deferred tax expense of $0 for all periods	(253)	(32)	(400)	(157)
Total Adjustments	(59)		89
Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent	2,568	(2,909)	(159)	(7,646)
Comprehensive Income Net Of Tax	4,115	890	10,195	2,659
Consolidation, Eliminations [Member]
Net income (loss)	(3,892)	(3,031)	(14,151)	(10,634)
Adjustments [Abstract]
Comprehensive Income Net Of Tax	$ (3,892)	$ (3,031)	$ (14,151)	$ (10,634)