The aggregate amount of net (gains) losses recognized in net period benefit cost due to remeasurement of future program costs from adjustments made to benefit plan design.

No definition available.

Name:	acw_Remeasurements
Namespace Prefix:	acw_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Subsequent Events (Details) - USD ($) $ in Thousands		3 Months Ended	9 Months Ended
Subsequent Events (Details) - USD ($) $ in Thousands	Oct. 01, 2015	Sep. 30, 2015	Sep. 30, 2015
Amendment to post-retirement benefits [Abstract]
Remeasurements		$ (1,380)	$ 16,491
Subsequent Event [Member]
Amendment to post-retirement benefits [Abstract]
Remeasurements	$ 9,000