Business Segments (Assets) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Mar. 31, 2015	Sep. 30, 2014	Mar. 31, 2014
Reconciliations of total assets from reportable segments to the condensed consolidated balance sheets
Total assets for reportable segments	$ 1,572,666	$ 1,169,933
Unallocated cash and cash equivalents	99,775	225,143	$ 114,651	$ 245,088
Consolidated total assets	1,572,666	1,169,933
Reportable segments
Reconciliations of total assets from reportable segments to the condensed consolidated balance sheets
Total assets for reportable segments	1,200,207	698,174
Consolidated total assets	1,200,207	698,174
Unallocated to Segments
Reconciliations of total assets from reportable segments to the condensed consolidated balance sheets
Unallocated cash and cash equivalents	99,775	225,143
Unallocated deferred tax assets	29,199	29,083
Other unallocated corporate assets	$ 243,485	$ 217,533