The intercompany cash outflow/inflow associated with intercompany transactions.

No definition available.

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- Definition

The cash outflow associated with capital expenditures associated with a divestiture.

+ References

No definition available.

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- Definition

The cash outflow associated with landfill operating agreements consisting of up-front or one-time payments, future minimum rental payments, including success/expansion fees, other direct costs and capping, closure and post closure costs.

+ References

No definition available.

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- Definition

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Cash

-URI http://asc.fasb.org/extlink&oid=6506951

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Cash Equivalents

-URI http://asc.fasb.org/extlink&oid=6507016

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 1

-Article 5

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

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-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.1)

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-Topic 210

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-Section 45

-Paragraph 1

-Subparagraph (a)

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-Topic 230

-SubTopic 10

-Section 45

-Paragraph 4

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- Definition

Amount of increase (decrease) in cash and cash equivalents. Cash and cash equivalents are the amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Includes effect from exchange rate changes.

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-Publisher FASB

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-Topic 230

-SubTopic 10

-Section 45

-Paragraph 24

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-Topic 830

-SubTopic 230

-Section 45

-Paragraph 1

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- Definition

Amount of cash inflow from realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 20

-Section 55

-Paragraph 24

-URI http://asc.fasb.org/extlink&oid=32706628&loc=d3e11374-113907

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- Definition

Increase (decrease) in cash associated with the entity's discontinued operations.

+ References

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Amount of cash inflow (outflow) of financing activities, excluding discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.

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-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 24

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-Topic 230

-SubTopic 10

-Section 45

-Paragraph 26

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- Definition

Amount of cash inflow (outflow) of investing activities, excluding discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 24

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-Topic 230

-SubTopic 10

-Section 45

-Paragraph 26

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- Definition

Amount of cash inflow (outflow) from operating activities, excluding discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

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-Section 45

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- Definition

The cash outflow for incremental, external costs directly pertaining to an early extinguishment of debt, including legal costs and prepayment penalties, and excluding interest and repayment of debt principal.

+ References

No definition available.

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- Definition

The cash outflow for loan and debt issuance costs.

+ References

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- Definition

The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 13

-Subparagraph (b)

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- Definition

The cash outflow associated with the purchase of all investments (debt, security, other) during the period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

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-Topic 230

-SubTopic 10

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-Paragraph 13

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- Definition

The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

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-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 13

-Subparagraph (c)

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- Definition

The cash inflow from the additional capital contribution to the entity.

+ References

+ Details

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- Definition

The cash inflow associated with security instrument that either represents a creditor or an ownership relationship with the holder of the investment security with a maturity of beyond one year or normal operating cycle, if longer. Includes proceeds from (a) debt, (b) capital lease obligations, (c) mandatory redeemable capital securities, and (d) any combination of (a), (b), or (c).

+ References

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- Definition

The total cash inflow associated with the amount received from holders to acquire the entity's shares under incentive and share awards, including stock option exercises. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

+ References

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- Definition

Amount of cash inflow from a noncontrolling interest. Includes, but is not limited to, purchase of additional shares or other increase in noncontrolling interest ownership.

+ References

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- Definition

The net cash inflow or outflow from other financing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 8

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-Topic 230

-SubTopic 10

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-Paragraph 9

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- Definition

The net cash inflow or outflow from cash and cash items that are not available for withdrawal or usage.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

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-Name Accounting Standards Codification

-Glossary Financing Activities

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-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

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- Definition

The cash inflow associated with the sale of equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

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-Paragraph 12

-Subparagraph (b)

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The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

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The cash outflow associated with security instruments that either represent a creditor or an ownership relationship with the holder of the investment security with a maturity of beyond one year or normal operating cycle, if longer. Includes repayments of (a) debt, (b) capital lease obligations, (c) mandatory redeemable capital securities, and (d) any combination of (a), (b), or (c).

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Subsidiary Guarantors - Schedule of Condensed Consolidating Statement of Cash Flows (Detail) (USD $) In Thousands, unless otherwise specified	8 Months Ended	12 Months Ended
	Dec. 31, 2014	Apr. 30, 2014	Apr. 30, 2013	Apr. 30, 2012
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	$ 38,286	$ 49,642	$ 43,906	$ 64,171
Cash Flows from Investing Activities:
Acquisitions, net of cash acquired	(360)	(8,305)	(25,225)	(2,102)
Additions to property, plant and equipment	(55,016)	(43,326)	(53,281)	(57,834)
Payments on landfill operating lease contracts	(4,739)cwst_PaymentsForLandfillOperatingLease	(6,505)cwst_PaymentsForLandfillOperatingLease	(6,261)cwst_PaymentsForLandfillOperatingLease	(6,616)cwst_PaymentsForLandfillOperatingLease
Payment for capital related to divestiture			(618)
Payments related to investments		(2,107)us-gaap_PaymentsToAcquireInvestments	(3,207)us-gaap_PaymentsToAcquireInvestments	(5,045)us-gaap_PaymentsToAcquireInvestments
Proceeds from sale of equity method investment		3,442
Proceeds from sale of property and equipment	463	1,524	883	1,492
Net cash provided by (used in) investing activities	(59,697)	(57,910)	(89,455)	(70,634)
Cash Flows from Financing Activities:
Proceeds from long-term borrowings	136,800	161,650	376,346	163,500
Principal payments on long-term debt	(109,281)	(152,380)	(360,858)	(152,806)
Change in restricted cash	(5,819)
Payment of tender premium on second lien notes			(10,743)
Payments of financing costs	(2,605)us-gaap_PaymentsOfFinancingCosts	(405)us-gaap_PaymentsOfFinancingCosts	(4,609)us-gaap_PaymentsOfFinancingCosts	(1,592)us-gaap_PaymentsOfFinancingCosts
Net proceeds from the issuance of class A common stock			42,184
Proceeds from the exercise of share based awards	143	143		337
Excess tax benefit on the vesting of share based awards	84		96	254
Contributions from noncontrolling interest holders			2,531	536
Other			(4,513)	591
Inter company borrowings
Net cash provided by (used in) financing activities	19,322	9,008	44,947	10,229
Net cash provided by (used in) discontinued operations	1,830	(31)	(2,177)	(1,049)
Net increase (decrease) in cash and cash equivalents	(259)	709	(2,779)	2,717
Cash and cash equivalents, beginning of period	2,464	1,755	4,534	1,817
Cash and cash equivalents, end of period	2,205	2,464	1,755	4,534
Discontinued operations:
Net cash provided by (used in) discontinued operations	1,830	(31)	(2,177)	(1,049)
Net increase (decrease) in cash and cash equivalents	(259)	709	(2,779)	2,717
Cash and cash equivalents, beginning of period	2,464	1,755	4,534	1,817
Cash and cash equivalents, end of period	2,205	2,464	1,755	4,534
Net cash provided by (used in) operating activities	38,286	49,642	43,906	64,171
Parent [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	(27,340)	(40,365)	(5,319)	4,552
Cash Flows from Investing Activities:
Acquisitions, net of cash acquired
Additions to property, plant and equipment	(1,433)	(1,675)	(203)	(574)
Payments on landfill operating lease contracts
Payment for capital related to divestiture
Payments related to investments		(2,107)	(4,166)	(2,740)
Proceeds from sale of equity method investment		3,442
Proceeds from sale of property and equipment
Net cash provided by (used in) investing activities	(1,433)	(340)	(4,369)	(3,314)
Cash Flows from Financing Activities:
Proceeds from long-term borrowings		161,650	334,497	163,500
Principal payments on long-term debt	(108,917)	(151,074)	(359,342)	(151,390)
Change in restricted cash	(5,819)
Payment of tender premium on second lien notes			(10,743)
Payments of financing costs	(2,605)	(405)		(1,592)
Net proceeds from the issuance of class A common stock			42,184
Proceeds from the exercise of share based awards	143
Excess tax benefit on the vesting of share based awards	84
Contributions from noncontrolling interest holders
Other			(4,513)	591
Inter company borrowings	145,332	31,425	5,066	(10,079)
Net cash provided by (used in) financing activities	28,218	41,596	7,149	1,030
Net cash provided by (used in) discontinued operations
Net increase (decrease) in cash and cash equivalents	(555)	891	(2,539)	2,268
Cash and cash equivalents, beginning of period	2,151	1,260	3,799	1,531
Cash and cash equivalents, end of period	1,596	2,151	1,260	3,799
Discontinued operations:
Net cash provided by (used in) discontinued operations
Net increase (decrease) in cash and cash equivalents	(555)	891	(2,539)	2,268
Cash and cash equivalents, beginning of period	2,151	1,260	3,799	1,531
Cash and cash equivalents, end of period	1,596	2,151	1,260	3,799
Net cash provided by (used in) operating activities	(27,340)	(40,365)	(5,319)	4,552
Guarantors [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	65,622	89,792	50,527	59,088
Cash Flows from Investing Activities:
Acquisitions, net of cash acquired	(360)	(8,305)	(25,225)	(2,102)
Additions to property, plant and equipment	(53,583)	(41,236)	(48,058)	(54,681)
Payments on landfill operating lease contracts	(4,739)	(6,505)	(6,261)	(6,616)
Payment for capital related to divestiture			(618)
Payments related to investments	(310)		(2,707)	(4,184)
Proceeds from sale of equity method investment
Proceeds from sale of property and equipment	463	1,524	883	1,492
Net cash provided by (used in) investing activities	(58,574)	(57,155)	(83,732)	(66,620)
Cash Flows from Financing Activities:
Proceeds from long-term borrowings	136,800		41,849
Principal payments on long-term debt	(364)	(1,306)	(1,516)	(1,416)
Change in restricted cash
Payment of tender premium on second lien notes
Payments of financing costs
Net proceeds from the issuance of class A common stock
Proceeds from the exercise of share based awards		143
Excess tax benefit on the vesting of share based awards
Contributions from noncontrolling interest holders
Other
Inter company borrowings	(145,332)	(31,425)	(5,066)	10,079
Net cash provided by (used in) financing activities	(8,896)	(32,588)	35,267	8,663
Net cash provided by (used in) discontinued operations	1,830	(31)	(2,177)	(1,049)
Net increase (decrease) in cash and cash equivalents	(18)	18	(115)	82
Cash and cash equivalents, beginning of period	271	253	368	286
Cash and cash equivalents, end of period	253	271	253	368
Discontinued operations:
Net cash provided by (used in) discontinued operations	1,830	(31)	(2,177)	(1,049)
Net increase (decrease) in cash and cash equivalents	(18)	18	(115)	82
Cash and cash equivalents, beginning of period	271	253	368	286
Cash and cash equivalents, end of period	253	271	253	368
Net cash provided by (used in) operating activities	65,622	89,792	50,527	59,088
Non-Guarantors [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	4	215	(1,302)	531
Cash Flows from Investing Activities:
Acquisitions, net of cash acquired
Additions to property, plant and equipment		(415)	(5,020)	(2,579)
Payments on landfill operating lease contracts
Payment for capital related to divestiture
Payments related to investments	310		3,666	1,879
Proceeds from sale of equity method investment
Proceeds from sale of property and equipment
Net cash provided by (used in) investing activities	310	(415)	(1,354)	(700)
Cash Flows from Financing Activities:
Proceeds from long-term borrowings
Principal payments on long-term debt
Change in restricted cash
Payment of tender premium on second lien notes
Payments of financing costs
Net proceeds from the issuance of class A common stock
Proceeds from the exercise of share based awards
Excess tax benefit on the vesting of share based awards
Contributions from noncontrolling interest holders			2,531	536
Other
Inter company borrowings
Net cash provided by (used in) financing activities			2,531	536
Net cash provided by (used in) discontinued operations
Net increase (decrease) in cash and cash equivalents	314	(200)	(125)	367
Cash and cash equivalents, beginning of period	42	242	367
Cash and cash equivalents, end of period	356	42	242	367
Discontinued operations:
Net cash provided by (used in) discontinued operations
Net increase (decrease) in cash and cash equivalents	314	(200)	(125)	367
Cash and cash equivalents, beginning of period	42	242	367
Cash and cash equivalents, end of period	356	42	242	367
Net cash provided by (used in) operating activities	4	215	(1,302)	531
Elimination [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities
Cash Flows from Investing Activities:
Acquisitions, net of cash acquired
Additions to property, plant and equipment
Payments on landfill operating lease contracts
Payment for capital related to divestiture
Payments related to investments
Proceeds from sale of equity method investment
Proceeds from sale of property and equipment
Net cash provided by (used in) investing activities
Cash Flows from Financing Activities:
Proceeds from long-term borrowings
Principal payments on long-term debt
Change in restricted cash
Payment of tender premium on second lien notes
Payments of financing costs
Net proceeds from the issuance of class A common stock
Proceeds from the exercise of share based awards
Excess tax benefit on the vesting of share based awards
Contributions from noncontrolling interest holders
Other
Inter company borrowings
Net cash provided by (used in) financing activities
Net cash provided by (used in) discontinued operations
Net increase (decrease) in cash and cash equivalents
Cash and cash equivalents, beginning of period
Cash and cash equivalents, end of period
Discontinued operations:
Net cash provided by (used in) discontinued operations
Net increase (decrease) in cash and cash equivalents
Cash and cash equivalents, beginning of period
Cash and cash equivalents, end of period
Net cash provided by (used in) operating activities
Acquisition [Member]
Cash Flows from Investing Activities:
Additions to property, plant and equipment	(45)	(2,633)	(1,746)	(529)
Acquisition [Member] \| Parent [Member]
Cash Flows from Investing Activities:
Additions to property, plant and equipment
Acquisition [Member] \| Guarantors [Member]
Cash Flows from Investing Activities:
Additions to property, plant and equipment	(45)	(2,633)	(1,746)	(529)
Acquisition [Member] \| Non-Guarantors [Member]
Cash Flows from Investing Activities:
Additions to property, plant and equipment
Acquisition [Member] \| Elimination [Member]
Cash Flows from Investing Activities:
Additions to property, plant and equipment
Transition Period 2014 [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	38,286
Cash Flows from Investing Activities:
Acquisitions, net of cash acquired	(360)
Additions to property, plant and equipment	(55,016)
Payments on landfill operating lease contracts	(4,739)
Proceeds from sale of property and equipment	463
Net cash provided by (used in) investing activities	(59,697)
Cash Flows from Financing Activities:
Proceeds from long-term borrowings	136,800
Principal payments on long-term debt	(109,281)
Change in restricted cash	(5,819)
Payments of financing costs	(2,605)
Proceeds from the exercise of share based awards	143
Excess tax benefit on the vesting of share based awards	84
Net cash provided by (used in) financing activities	19,322
Net cash provided by (used in) discontinued operations	1,830
Net increase (decrease) in cash and cash equivalents	(259)
Cash and cash equivalents, beginning of period	2,464
Cash and cash equivalents, end of period	2,205
Discontinued operations:
Net cash provided by (used in) discontinued operations	1,830
Net increase (decrease) in cash and cash equivalents	(259)
Cash and cash equivalents, beginning of period	2,464
Cash and cash equivalents, end of period	2,205
Net cash provided by (used in) operating activities	38,286
Transition Period 2014 [Member] \| Acquisition [Member]
Cash Flows from Investing Activities:
Additions to property, plant and equipment	$ (45)