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Commitments and Contingencies (Details) $ in Millions	12 Months Ended
	May 31, 2019 USD ($) state	May 31, 2018 USD ($)	May 31, 2017 USD ($)
Operating Leased Assets [Line Items]
Operating lease expense	$ 22.8	$ 26.0	$ 24.9
Capital lease amortization expense	1.6	1.3	$ 1.1
Open standby letters of credit	$ 5.3	$ 5.3
Minimum [Member]
Operating Leased Assets [Line Items]
Capital lease period	1 year
Maximum [Member]
Operating Leased Assets [Line Items]
Capital lease period	10 years
Book Clubs
Operating Leased Assets [Line Items]
States with sales tax remitted (in states) | state	39

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Lessee Leasing Arrangements, Capital Leases, Term of Contract

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Number of States, Sales Tax Remitted

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- Definition

The charge for the use of long-lived depreciable capital leased assets for the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=84164758&loc=d3e45031-112735

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-Section 55
-Paragraph 1
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- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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- Definition

Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

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-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 50
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