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Summary of Intangible Assets Acquired and Weighted Average Useful Lives of Definite-lived Intangible Assets (Details) - USD ($) $ in Thousands | Apr. 22, 2016 | Jan. 29, 2016
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Initial Montana Acquisition [Member] |  |
Acquired Finite Lived Intangible Assets [Line Items] |  |
Intangible Assets As Recorded, at Fair Value |  | $ 14,400
Second Montana Acquisition [Member] |  |
Acquired Finite Lived Intangible Assets [Line Items] |  |
Intangible Assets As Recorded, at Fair Value | $ 11,400 |
Customer Relationships [Member] | Initial Montana Acquisition [Member] |  |
Acquired Finite Lived Intangible Assets [Line Items] |  |
Weighted Average Useful Lives of Definite-lived Intangible Assets |  | 15 years
Intangible Assets As Recorded, at Fair Value |  | $ 9,800
Customer Relationships [Member] | Second Montana Acquisition [Member] |  |
Acquired Finite Lived Intangible Assets [Line Items] |  |
Weighted Average Useful Lives of Definite-lived Intangible Assets | 15 years |
Intangible Assets As Recorded, at Fair Value | $ 9,100 |
Noncompete Agreements [Member] | Initial Montana Acquisition [Member] |  |
Acquired Finite Lived Intangible Assets [Line Items] |  |
Weighted Average Useful Lives of Definite-lived Intangible Assets |  | 5 years
Intangible Assets As Recorded, at Fair Value |  | $ 3,900
Noncompete Agreements [Member] | Second Montana Acquisition [Member] |  |
Acquired Finite Lived Intangible Assets [Line Items] |  |
Weighted Average Useful Lives of Definite-lived Intangible Assets | 5 years |
Intangible Assets As Recorded, at Fair Value | $ 1,800 |
Trade Names [Member] | Initial Montana Acquisition [Member] |  |
Acquired Finite Lived Intangible Assets [Line Items] |  |
Weighted Average Useful Lives of Definite-lived Intangible Assets |  | 4 years
Intangible Assets As Recorded, at Fair Value |  | $ 500
Trade Names [Member] | Second Montana Acquisition [Member] |  |
Acquired Finite Lived Intangible Assets [Line Items] |  |
Weighted Average Useful Lives of Definite-lived Intangible Assets | 4 years |
Intangible Assets As Recorded, at Fair Value | $ 200 |
Other [Member] | Initial Montana Acquisition [Member] |  |
Acquired Finite Lived Intangible Assets [Line Items] |  |
Weighted Average Useful Lives of Definite-lived Intangible Assets |  | 15 years
Intangible Assets As Recorded, at Fair Value |  | $ 200
Other [Member] | Second Montana Acquisition [Member] |  |
Acquired Finite Lived Intangible Assets [Line Items] |  |
Weighted Average Useful Lives of Definite-lived Intangible Assets | 15 years |
Intangible Assets As Recorded, at Fair Value | $ 300 |

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- 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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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition The amount of identifiable intangible assets recognized as of the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=84160947&loc=d3e2207-128464 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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