XML 56 R44.htm IDEA: XBRL DOCUMENT
v3.21.2

Business Combinations - Narrative (Details) $ / shares in Units, $ in Thousands, £ in Millions, $ in Millions, $ in Millions |  |  |  |  |  |  |  |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 01, 2021 USD ($) | Aug. 02, 2021 USD ($) | Jun. 01, 2021 USD ($) | May 28, 2021 USD ($) | May 28, 2021 GBP (£) | May 05, 2021 USD ($) | Mar. 01, 2021 USD ($) | Mar. 01, 2021 CAD ($) | Dec. 30, 2020 USD ($) shares | Nov. 02, 2020 USD ($) | Aug. 31, 2020 USD ($) | Aug. 31, 2020 AUD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) shares | May 28, 2021 GBP (£) | Dec. 29, 2020 $ / shares
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate cash consideration |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 616,316 | $ 398,737 |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,039,850 | $ 1,039,850 |  | $ 794,335 |  |
Share price (in usd per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 36.15
Customer relationships |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Useful life (in years) |  |  |  |  |  |  |  |  |  |  |  |  |  | 25 years |  |  |  |
Liberty Freezers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate cash consideration |  |  |  |  |  |  | $ 43,500 | $ 55.0 |  |  |  |  |  |  |  |  |  |
Cash received |  |  |  |  |  |  | 1,400 | 1.8 |  |  |  |  |  |  |  |  |  |
Land |  |  |  |  |  |  | 3,200 |  |  |  |  |  |  |  |  |  |  |
Buildings and improvements |  |  |  |  |  |  | 13,900 |  |  |  |  |  |  |  |  |  |  |
Machinery and equipment |  |  |  |  |  |  | 3,700 |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | 12,400 |  |  |  |  |  |  |  |  |  |  |
Operating lease right-of-use assets |  |  |  |  |  |  | 29,000 |  |  |  |  |  |  |  |  |  |  |
Deferred tax liability |  |  |  |  |  |  | 7,100 |  |  |  |  |  |  |  |  |  |  |
Consideration for acquisition |  |  |  |  |  |  | 43,500 | $ 55.0 |  |  |  |  |  |  |  |  |  |
Liberty Freezers | Customer relationships |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Customer relationships |  |  |  |  |  |  | $ 8,000 |  |  |  |  |  |  |  |  |  |  |
Weighted average remaining intangible amortization life (in months) |  |  |  |  |  |  | 25 years | 25 years |  |  |  |  |  |  |  |  |  |
KMT Brrr! |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate cash consideration |  |  |  |  |  | $ 70,800 |  |  |  |  |  |  |  |  |  |  |  |
Cash received |  |  |  |  |  | 500 |  |  |  |  |  |  |  |  |  |  |  |
Land |  |  |  |  |  | 8,400 |  |  |  |  |  |  |  |  |  |  |  |
Buildings and improvements |  |  |  |  |  | 46,700 |  |  |  |  |  |  |  |  |  |  |  |
Machinery and equipment |  |  |  |  |  | 11,500 |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  | 1,600 |  |  |  |  |  |  |  |  |  |  |  |
KMT Brrr! | Customer relationships |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Customer relationships |  |  |  |  |  | $ 1,100 |  |  |  |  |  |  |  |  |  |  |  |
Weighted average remaining intangible amortization life (in months) |  |  |  |  |  | 25 years |  |  |  |  |  |  |  |  |  |  |  |
Bowman Stores |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate cash consideration |  |  |  | $ 107,100 | £ 75.5 |  |  |  |  |  |  |  |  |  |  |  |  |
Cash received |  |  |  | 3,400 | £ 2.4 |  |  |  |  |  |  |  |  |  |  |  |  |
Land |  |  |  | 6,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Buildings and improvements |  |  |  | 33,600 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Machinery and equipment |  |  |  | 17,800 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  | 34,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred tax liability |  |  |  | 12,700 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred consideration |  |  |  | 11,800 |  |  |  |  |  |  |  |  |  |  |  |  | £ 8.3 |
Bowman Stores | Customer relationships |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Customer relationships |  |  |  | $ 25,300 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average remaining intangible amortization life (in months) |  |  |  | 25 years | 25 years |  |  |  |  |  |  |  |  |  |  |  |  |
AM-C Warehouses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate cash consideration |  |  |  |  |  |  |  |  |  |  | $ 82,700 |  |  |  |  |  |  |
Halls Warehouse Corporation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate cash consideration |  |  |  |  |  |  |  |  |  | $ 489,200 |  |  |  |  |  |  |  |
Cash received |  |  |  |  |  |  |  |  |  | 7,900 |  |  |  |  |  |  |  |
Land |  |  |  |  |  |  |  |  |  | 29,352 |  |  | 32,560 | $ 32,560 |  |  |  |
Machinery and equipment |  |  |  |  |  |  |  |  |  | 63,596 |  |  | 25,348 | 25,348 |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  | 42,737 |  |  | 172,986 | 172,986 |  |  |  |
Operating lease right-of-use assets |  |  |  |  |  |  |  |  |  | 26,400 |  |  | 27,139 | 27,139 |  |  |  |
Deferred tax liability |  |  |  |  |  |  |  |  |  | 5,012 |  |  | 13,385 | 13,385 |  |  |  |
Halls Warehouse Corporation | Customer relationships |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Customer relationships |  |  |  |  |  |  |  |  |  | $ 102,732 |  |  | 104,000 | 104,000 |  |  |  |
Agro Merchants Group |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate cash consideration |  |  |  |  |  |  |  |  | $ 1,080,000 |  |  |  |  |  |  |  |  |
Cash received |  |  |  |  |  |  |  |  | 47,500 |  |  |  |  |  |  |  |  |
Land |  |  |  |  |  |  |  |  | 95,286 |  |  |  | 152,035 | 152,035 |  |  |  |
Machinery and equipment |  |  |  |  |  |  |  |  | 206,453 |  |  |  | 227,940 | 227,940 |  |  |  |
Goodwill |  |  |  |  |  |  |  |  | 346,673 |  |  |  | 404,223 | 404,223 |  | $ 404,200 |  |
Operating lease right-of-use assets |  |  |  |  |  |  |  |  | 191,229 |  |  |  | 203,781 | 203,781 |  |  |  |
Deferred tax liability |  |  |  |  |  |  |  |  | 175,719 |  |  |  | 126,334 | 126,334 |  |  |  |
Consideration for acquisition |  |  |  |  |  |  |  |  | 1,590,000 |  |  |  |  |  |  |  |  |
Deferred consideration |  |  |  |  |  |  |  |  | $ 49,700 |  |  |  |  |  |  |  |  |
Number of shares issued (in shares) | shares |  |  |  |  |  |  |  |  | 14,166,667 |  |  |  |  |  |  | 46,100,000 |  |
Shares issued for acquisition |  |  |  |  |  |  |  |  | $ 512,100 |  |  |  |  |  |  |  |  |
Financing lease and sale-leaseback obligations |  |  |  |  |  |  |  |  | 105,400 |  |  |  |  |  |  |  |  |
Consideration, including financing and sale-leaseback obligations |  |  |  |  |  |  |  |  | 1,700,000 |  |  |  |  |  |  |  |  |
Agro Merchants Group | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue since date of acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  | 140,900 |  |  |  |
Net income since date of acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  | (11,100) |  |  |  |
Agro Merchants Group | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue since date of acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  | 256,900 |  |  |  |
Net income since date of acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  | (23,600) |  |  |  |
Agro Merchants Group | Customer relationships |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Customer relationships |  |  |  |  |  |  |  |  | $ 333,501 |  |  |  | $ 275,144 | $ 275,144 |  | $ 275,100 |  |
Useful life (in years) |  |  |  |  |  |  |  |  |  |  |  |  | 25 years |  |  |  |  |
Newark Facility Management |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate cash consideration | $ 391,400 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash received | 1,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Land | 30,300 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Buildings and improvements | 51,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Machinery and equipment | 24,400 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill | $ 17,200 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average remaining intangible amortization life (in months) | 25 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration for acquisition | $ 391,400 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Newark Facility Management | Customer relationships |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Customer relationships | $ 269,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ColdCo |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate cash consideration |  | $ 20,700 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash received |  | 300 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Land |  | 1,300 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Buildings and improvements |  | 10,300 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Machinery and equipment |  | 2,700 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  | $ 1,800 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average remaining intangible amortization life (in months) |  | 25 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ColdCo | Customer relationships |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Customer relationships |  | $ 4,300 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lago Cold Stores |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate cash consideration |  |  |  |  |  |  |  |  |  |  |  | $ 100.8 |  |  |  |  |  |
Frigorifico |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate cash consideration |  |  | $ 16,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of voting interests acquired |  |  | 35.00% |  |  |  |  |  |  |  |  |  |  |  |  | 65.00% |  |

X
- Definition Business Combination, Consideration Transferred, Including Leasing Obligations + References No definition available. + Details
Name: | art_BusinessCombinationConsiderationTransferredIncludingLeasingObligations
Namespace Prefix: | art_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Operating Lease, Right-of-Use Asset + References No definition available. + Details
Name: | art_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedOperatingLeaseRightofUseAsset
Namespace Prefix: | art_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- 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://fasb.org/us-gaap/role/ref/legacyRef -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
Name: | us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of shares of equity interests issued or issuable to acquire entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b)(4) -URI http://asc.fasb.org/extlink&oid=120321790&loc=d3e6927-128479 + Details
Name: | us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | us-gaap_BusinessAcquisitionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
Name: | us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=116859721&loc=d3e6613-128477 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120321790&loc=d3e6927-128479 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=116859721&loc=d3e6578-128477 + Details
Name: | us-gaap_BusinessCombinationConsiderationTransferred1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of equity interests of the acquirer, including instruments or interests issued or issuable in consideration for the business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=116859721&loc=d3e6613-128477 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=116859721&loc=d3e6578-128477 + Details
Name: | us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of liability recognized arising from contingent consideration in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=120321790&loc=d3e6927-128479 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 35 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=116859824&loc=d3e6819-128478 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476 + Details
Name: | us-gaap_BusinessCombinationContingentConsiderationLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition This element represents the amount of earnings or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
Name: | us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
Name: | us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of facility held for productive use including, but not limited to, office, production, storage and distribution facilities, acquired at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123413009&loc=d3e4845-128472 + Details
Name: | us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of lease obligation assumed in business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123413009&loc=d3e4845-128472 + Details
Name: | us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCapitalLeaseObligation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of deferred tax liability attributable to taxable temporary differences assumed at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123413009&loc=d3e4845-128472 + Details
Name: | us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of tangible personal property used to produce goods and services, including, but is not limited to, tools, dies and molds, computer and office equipment, acquired at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123413009&loc=d3e4845-128472 + Details
Name: | us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedEquipment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of identifiable intangible assets recognized as of the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=123455525&loc=d3e2207-128464 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123413009&loc=d3e4845-128472 + Details
Name: | us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of real estate acquired, at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123413009&loc=d3e4845-128472 + Details
Name: | us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The cash inflow associated with the acquisition of business during the period (for example, cash that was held by the acquired business). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3179-108585 + Details
Name: | us-gaap_CashAcquiredFromAcquisition
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_FiniteLivedIntangibleAssetUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(10)(1)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=120320667&loc=SL49117168-202975 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=84165509&loc=d3e56426-112766 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
Name: | us-gaap_Goodwill
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3213-108585 + Details
Name: | us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Price of a single share of a number of saleable stocks of a company. + References No definition available. + Details
Name: | us-gaap_SharePrice
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_CustomerRelationshipsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=art_LibertyFreezersMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=art_KMTBrrrMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=art_BowmanStoresMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=art_AMCWarehousesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=art_HallsWarehouseCorporationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=art_AgroMerchantsGroupMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=art_NewarkFacilityManagementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=art_ColdCoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=art_LagoColdStoresMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=art_FrigorificoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |