Increase in additional paid in capital due to warrants issued during the period. Includes also the proceeds of debt securities issued with detachable stock purchase warrants that are allocable to the warrants. These warrants qualify for equity classification and provide the holder with a right to purchase stock from the entity.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 12

-Paragraph 10

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 31

-Article 5

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

-URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 470

-SubTopic 20

-Section 25

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=7656322&loc=d3e4724-112606

Reference 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Warrant

-URI http://asc.fasb.org/extlink&oid=6528364

Reference 8: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 14

-Paragraph 16

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

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

- Definition

The exercise price of each class of warrants or rights outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(i)(4))

-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph i

-Subparagraph 4

-Article 4

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	us-types:perUnitItemType
Balance Type:	na
Period Type:	instant

- Details

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Data Type:	xbrli:stringItemType
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Period Type:	duration

- Definition

Portion of the balance sheet assertion valued at fair value by the entity 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. This item represents warrants not settleable in cash classified as equity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

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

- Definition

Represents the warrants as a percentage of common stock on a fully diluted basis.

+ References

No definition available.

+ Details

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Namespace Prefix:	zlc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The ratio applied to warrants for the purpose of determining the number of shares of the common stock into which the warrants will be converted.

+ References

No definition available.

+ Details

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Namespace Prefix:	zlc_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the number of warrants issued.

+ References

No definition available.

+ Details

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

- Definition

The amount of discount that was originally recognized at the issuance of the warrants that has yet to be amortized.

+ References

No definition available.

+ Details

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Namespace Prefix:	zlc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Represents the mark-to-market gain associated with the warrants.

+ References

No definition available.

+ Details

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Namespace Prefix:	zlc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Represents the number of directors designated by the warrant holders under the first scenario.

+ References

No definition available.

+ Details

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Namespace Prefix:	zlc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the number of directors designated by the warrant holders under the second scenario.

+ References

No definition available.

+ Details

Name:	zlc_NumberOfDirectorsDesignatedByWarrantHoldersUnderSecondScenario
Namespace Prefix:	zlc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

LONG-TERM DEBT (Details 2) (USD $) In Millions, except Per Share data, unless otherwise specified	1 Months Ended	3 Months Ended
	May 31, 2010	Jul. 31, 2010	Sep. 24, 2010	May 10, 2010 item
Warrant
Warrant and Registration Rights Agreement
Warrants conversion ratio	1
Exercise price of warrants (in dollars per share)				$ 2.00
Warrants as a percentage of common stock on a fully diluted basis	25.00%
Number of directors designated by the warrant holders under first scenario				2
Number of directors designated by the warrant holders under second scenario				3
Fair value of the warrants				$ 21.3
Mark-to-market gain		8.3
Warrants reclassified to stockholders' investment and included in additional paid-in capital		13.0
Unamortized discount associated with the Warrants charged to interest expense			$ 20.3
A-Warrants \| Senior secured term loan prior to September 2010 amendment
Warrant and Registration Rights Agreement
Number of warrants issued	6.4
B-Warrants \| Senior secured term loan prior to September 2010 amendment
Warrant and Registration Rights Agreement
Number of warrants issued	4.7