Retirement Benefits - Employee stock ownership plan (ESOP) (Details) - USD ($) $ in Thousands	12 Months Ended
Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Shares held by ESOP (in shares)	6,476,154	6,911,436	7,728,332
Company matching contributions	$ 65,262	$ 57,766	$ 58,922
Number of shares invested by employees in company stock (in shares)	1,870,286
Defined contribution plan expense recognized	$ 29,023	29,309	$ 25,780
CLARCOR, Inc
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Defined contribution plan expense recognized	$ 4,481	$ 2,199
Maximum
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Maximum percentage of employer 401K matching contribution	4.00%

Shares Invested By Employees In Company Stock

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- Definition

Amount of cost for defined contribution plan.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942

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- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

+ References

No definition available.

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- Definition

This item represents the amount of cash contributions during the period made by the entity to the Employee Stock Ownership Plan (ESOP).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 40
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109244661&loc=d3e17540-113929

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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.

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- Definition

Sum of the allocated, committed-to-be-released and suspense shares of the entity held by the plan.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 40
-Section 50
-Paragraph 1
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=109244661&loc=d3e17540-113929

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