Reorganization Items, Net and Liabilities Subject to Compromise Reorganization Items, Net and Liabilities Subject to Compromise (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended			6 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012	Mar. 31, 2013 Senior Subordinated Notes Dex One Senior Subordinated Notes
Reorganization Items [Abstract]
Write-off of remaining unamortized fair value adjustments	$ 31,761
Professional fees	4,142
Total reorganization items, net	35,903	0
Liabilities Subject to Compromise [Abstract]
Liabilities subject to compromise	$ 1,745,008		$ 0
Percentage of Interest Payments Made in Cash				50.00%
Percentage of Interest Payments Made With PIK Interest				50.00%