Decrease in noncontrolling interest (for example, but not limited to, redeeming or purchasing the interests of noncontrolling shareholders, issuance of shares (interests) by the non-wholly owned subsidiary to the parent entity for other than cash, and a buyback of shares (interest) by the non-wholly owned subsidiary from the noncontrolling interests).

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 45
-Paragraph 23
-URI http://asc.fasb.org/extlink&oid=51664549&loc=SL4569655-111683

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 45
-Paragraph 24
-URI http://asc.fasb.org/extlink&oid=51664549&loc=SL4616395-111683

Name:	us-gaap_MinorityInterestDecreaseFromRedemptions
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Redeemable Noncontrolling Interests (Details) $ in Millions	3 Months Ended	12 Months Ended
Redeemable Noncontrolling Interests (Details) $ in Millions	Jul. 31, 2016 USD ($)	Oct. 31, 2016 USD ($) joint_venture	Apr. 30, 2016 USD ($)
Noncontrolling Interest [Line Items]
Redemption price	$ 5.5	$ 5.5
Paper Packaging And Services
Noncontrolling Interest [Line Items]
Number of joint ventures (joint venture) \| joint_venture		1
Rigid Industrial Packaging & Services
Noncontrolling Interest [Line Items]
Number of joint ventures (joint venture) \| joint_venture		1
Container Life Cycle Management LLC
Noncontrolling Interest [Line Items]
Redemption value		$ 0.8	$ 0.8
Container Life Cycle Management LLC \| Other Long Term Liabilities
Noncontrolling Interest [Line Items]
Redemption value		$ 9.0