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Business Segments, Concentration of Business, and Credit Risk and Significant Customers (Assets) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Mar. 31, 2014	Sep. 30, 2013	Mar. 31, 2013
Reconciliations of total assets from reportable segments to the condensed consolidated balance sheets
Total assets for reportable segments	$ 1,416,841us-gaap_Assets	$ 1,064,204us-gaap_Assets
Unallocated cash and cash equivalents	369,442	245,088	237,125	64,591
Consolidated total assets	1,416,841us-gaap_Assets	1,064,204us-gaap_Assets
Reportable segments
Reconciliations of total assets from reportable segments to the condensed consolidated balance sheets
Total assets for reportable segments	826,373	654,679
Consolidated total assets	826,373	654,679
Unallocated to Segments
Reconciliations of total assets from reportable segments to the condensed consolidated balance sheets
Unallocated cash and cash equivalents	369,442	245,088
Unallocated deferred tax assets	37,523	38,933
Other unallocated corporate assets	$ 183,503	$ 125,504