Shares Repurchase - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	1 Months Ended	3 Months Ended
May 31, 2008	May 31, 2007	Sep. 29, 2012	Oct. 01, 2011
Stock repurchase program, Authorized amount	$ 175.0	$ 100.0
Stock repurchase program, Remaining authorized repurchase amount			57.9
Stock repurchase program, Authorized amount			$ 0	$ 0

The cash outflow to reacquire common stock during the period authorized by an entity's Board of Directors under a stock repurchase plan

No definition available.

Name:	gksr_PaymentsForRepurchaseOfCommonStockUnderShareRepurchaseProgram
Namespace Prefix:	gksr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration