Represent the number of shares that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

No definition available.

+ Details

Name:	acet_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareShare
Namespace Prefix:	acet_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- References

No definition available.

+ Details

Name:	acet_NetIncomePerCommonShareLineItems
Namespace Prefix:	acet_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of shares of equity interests issued or issuable to acquire entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)(4)
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

+ Details

Name:	us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

The price per share of the conversion feature embedded in the debt instrument.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031898-161870

+ Details

Name:	us-gaap_DebtInstrumentConvertibleConversionPrice1
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_BusinessAcquisitionAxis=acet_CitronPharmaLimitedLiabilityCompanyAndLucidPharmaLimitedLiabilityCompanyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=us-gaap_SeniorNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Net Income Per Common Share (Narrative) (Detail) - $ / shares shares in Thousands	1 Months Ended	3 Months Ended
	Dec. 21, 2016	Sep. 30, 2017	Nov. 30, 2015
Net Income Per Common Share [Line Items]
Common equivalent shares outstanding not included in calculation of diluted net income per common share		61
Citron and Lucid
Net Income Per Common Share [Line Items]
Number of shares issued in connection with acquisition included in weighted average shares outstanding	5,122
Convertible Senior Notes
Net Income Per Common Share [Line Items]
Senior notes, initial conversion price per share			$ 33.215