Earnings (Loss) Per Share (Antidilutive Securities) (Details) - shares shares in Thousands	12 Months Ended
Dec. 30, 2016	Jan. 01, 2016	Jan. 02, 2015
Anitdilutive Securities Excluded From Earnings Per Share [Abstract]
Time-vested stock options, restricted stock and restricted stock units	657	1,718	176
Performance-vested stock options and restricted stock units	357	578	0

Performance-Based Vesting Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

No definition available.

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Namespace Prefix:	gb_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration