Environmental Matters (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended	6 Months Ended
Aug. 31, 2011 item	Feb. 28, 2013
Environmental Matters
Number of Minnesota factories at which environmental violations were alleged by US EPA	3
Period over which the entity identified capital expenditures for environmental related projects		3 years
Identified capital expenditures for environmental related projects		$ 26.5

Represents the number of factories for which the entity received a Finding of Violation and Notice of Violation from the United States Environmental Protection Agency (EPA) for alleged violations of the Clean Air Act concerning certain air emissions.

No definition available.

Name:	acsc_EnvironmentalRemediationNumberOfFactories
Namespace Prefix:	acsc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration