Net Income Per Share (Details Textual) In Millions, unless otherwise specified	Mar. 29, 2013	Mar. 30, 2012
Net Income Per Share (Textual) [Abstract]
Anti-dilutive stock options outstanding	0.1	0.2

Antidilutive securities not included from computation of earnings per share amount.

No definition available.

Name:	ctgx_AntidilutiveSecuritiesNotIncludedFromComputationOfEarningsPerShareAmount
Namespace Prefix:	ctgx_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant