Restricted Cash (Detail Textuals) (USD $) In Millions, unless otherwise specified	1 Months Ended	9 Months Ended
Jan. 31, 2013	Sep. 28, 2013	Dec. 30, 2011
Amount of proceeds deposited in escrow account related to transaction with Leucadia			$ 36.9
Percentage of escrow funds for indemnification claims for first year	40.00%
Proceeds from escrow deposits	$ 14.8
Percentage of escrow funds for indemnification claims for second year		60.00%
Description of restricted cash		If no indemnification claims arise during the second year, the remaining 60% of the funds will be distributed to USPB.

The designation of funds furnished by a borrower to a lender to assure future payments of the borrower's real estate taxes and insurance obligations with respect to a mortgaged property. Escrow deposits may be made for a variety of other purposes such as earnest money and contingent payments. This element excludes replacement reserves which are an escrow separately provided for within the US GAAP taxonomy.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.10)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ Details

Name:	us-gaap_EscrowDeposit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Describe the restrictions with respect to withdrawal or usage and the specific cash or cash equivalent item. Restrictions may include contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 305

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6478312&loc=d3e61473-112792

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 1

-Article 5

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.1)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.1(a))

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Subparagraph a

-Article 9

+ Details

Name:	us-gaap_RestrictedCashAndCashEquivalentItemDescription
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the percentage of escrow funds for indemnification claims for first year.

+ References

No definition available.

+ Details

Name:	uspb_PercentageOfEscrowFundsForIndemnificationClaimsForFirstYear
Namespace Prefix:	uspb_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the percentage of escrow funds for indemnification claims for second year.

+ References

No definition available.

+ Details

Name:	uspb_PercentageOfEscrowFundsForIndemnificationClaimsForSecondYear
Namespace Prefix:	uspb_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the amount received from escrow deposit funds during the period.

+ References

No definition available.

+ Details

Name:	uspb_ProceedsFromEscrowDeposits
Namespace Prefix:	uspb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration