Debt (Credit Facility) (Details)		6 Months Ended
Oct. 27, 2015 USD ($) loan_facility	Jun. 29, 2018 USD ($)
Senior Notes [Member] \| 9.125% Senior Notes due 2023 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 360,000,000
Debt Instrument, Maturity Date	Nov. 01, 2023
Long-term Debt, Fair Value		$ 392,000,000
Stated interest rate	9.125%	9.125%
Secured Debt [Member] \| Revolving Credit Facility [Member] \| New Revolving Credit Facility 2015 [Member]
Debt Instrument [Line Items]
Credit Facility Maximum Borrowing Capacity	$ 200,000,000
Debt Instrument, Maturity Date	Oct. 27, 2020
Revolving line of credit		$ 74,000,000
Line of Credit Facility, Remaining Borrowing Capacity		116,800,000
Letters of Credit Outstanding, Amount		$ 9,200,000
Debt Weighted Average Interest Rate		5.34%
Secured Debt [Member] \| Loans Payable [Member]
Debt Instrument [Line Items]
Debt Instrument, Covenant Compliance, Number Of Additional Term Loan Facilities That May Be Added \| loan_facility	1
Secured Debt [Member] \| Loans Payable [Member] \| Term Loan A (TLA) Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 375,000,000
Debt Instrument, Maturity Date	Oct. 27, 2021
Debt Weighted Average Interest Rate		5.36%
Debt Instrument, Covenant Compliance, Maximum Leverage Ratio	6.0
Debt Instrument, Covenant Compliance, Adjusted EBITDA To Interest Expense Ratio	2.75
Secured Debt [Member] \| Loans Payable [Member] \| Term Loan B (TLB) Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 1,025,000,000
Debt Instrument, Discount, Percentage	1.00%
Reduction to the variable rate basis spread		0.25%
Debt Instrument, Maturity Date	Oct. 27, 2022
Debt Weighted Average Interest Rate		5.30%
Long-term Debt, Fair Value		$ 815,000,000
Secured Debt [Member] \| Loans Payable [Member] \| Term Loan B (TLB) Facility [Member] \| Prime Rate [Member]
Debt Instrument [Line Items]
Variable rate basis spread	2.25%
Secured Debt [Member] \| Loans Payable [Member] \| Term Loan B (TLB) Facility [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Variable rate basis spread	3.25%
Debt Instrument, Interest Rate, Floor	1.00%
Secured Debt [Member] \| Swingline Loans [Member] \| New Revolving Credit Facility 2015 [Member]
Debt Instrument [Line Items]
Credit Facility Maximum Borrowing Capacity	$ 15,000,000
Secured Debt [Member] \| Standby Letters of Credit [Member] \| New Revolving Credit Facility 2015 [Member]
Debt Instrument [Line Items]
Credit Facility Maximum Borrowing Capacity	$ 25,000,000
Secured Debt [Member] \| Minimum [Member] \| Revolving Credit Facility [Member] \| New Revolving Credit Facility 2015 [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	0.175%
Secured Debt [Member] \| Minimum [Member] \| Revolving Credit Facility [Member] \| New Revolving Credit Facility 2015 [Member] \| Prime Rate [Member]
Debt Instrument [Line Items]
Variable rate basis spread	0.75%
Secured Debt [Member] \| Minimum [Member] \| Revolving Credit Facility [Member] \| New Revolving Credit Facility 2015 [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Variable rate basis spread	1.75%
Secured Debt [Member] \| Minimum [Member] \| Loans Payable [Member] \| Term Loan A (TLA) Facility [Member] \| Prime Rate [Member]
Debt Instrument [Line Items]
Variable rate basis spread	0.75%
Secured Debt [Member] \| Minimum [Member] \| Loans Payable [Member] \| Term Loan A (TLA) Facility [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Variable rate basis spread	1.75%
Secured Debt [Member] \| Maximum [Member] \| Senior Secured Credit Facilities [Member]
Debt Instrument [Line Items]
Debt Instrument, Covenant Compliance, First Lien Net Leverage Ratio	4.25
Secured Debt [Member] \| Maximum [Member] \| Revolving Credit Facility [Member] \| New Revolving Credit Facility 2015 [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	0.25%
Secured Debt [Member] \| Maximum [Member] \| Revolving Credit Facility [Member] \| New Revolving Credit Facility 2015 [Member] \| Prime Rate [Member]
Debt Instrument [Line Items]
Variable rate basis spread	2.25%
Secured Debt [Member] \| Maximum [Member] \| Revolving Credit Facility [Member] \| New Revolving Credit Facility 2015 [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Variable rate basis spread	3.25%
Secured Debt [Member] \| Maximum [Member] \| Loans Payable [Member]
Debt Instrument [Line Items]
Debt Instrument, Covenant Compliance, First Lien Net Leverage Ratio	4.25
Secured Debt [Member] \| Maximum [Member] \| Loans Payable [Member] \| Term Loan A (TLA) Facility [Member] \| Prime Rate [Member]
Debt Instrument [Line Items]
Variable rate basis spread	2.25%
Secured Debt [Member] \| Maximum [Member] \| Loans Payable [Member] \| Term Loan A (TLA) Facility [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Variable rate basis spread	3.25%

Debt Instrument, Covenant Compliance, Adjusted EBITDA To Interest Expense Ratio

No definition available.

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- Definition

Debt Instrument, Covenant Compliance, First Lien Net Leverage Ratio

+ References

No definition available.

+ Details

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- Definition

Debt Instrument, Covenant Compliance, Maximum Leverage Ratio

+ References

No definition available.

+ Details

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- Definition

Debt Instrument, Covenant Compliance, Number Of Additional Term Loan Facilities That May Be Added

+ References

No definition available.

+ Details

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Namespace Prefix:	gb_
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Period Type:	duration

- Definition

Debt Instrument, Discount, Percentage

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

Debt Instrument, Increase (Decrease) In Basis Spread On Variable Rate

+ References

No definition available.

+ Details

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Namespace Prefix:	gb_
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Balance Type:	na
Period Type:	duration

- Definition

Debt Instrument, Interest Rate, Floor

+ References

No definition available.

+ Details

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Namespace Prefix:	gb_
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Balance Type:	na
Period Type:	duration

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

Name:	us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ Details

Name:	us-gaap_LineOfCredit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

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Name:	us-gaap_DebtInstrumentAxis=gb_SeniorNotesDueNovember2023Member
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Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_RevolvingCreditFacilityMember
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Name:	us-gaap_DebtInstrumentAxis=gb_NewRevolvingCreditFacility2015Member
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Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_LoansPayableMember
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Name:	us-gaap_VariableRateAxis=us-gaap_PrimeRateMember
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Name:	us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
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- Details

Name:	us-gaap_LongtermDebtTypeAxis=gb_SwinglineLoansMember
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- Details

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