Revenue, Receivables and Contract Assets and Liabilities (Details 5) $ in Thousands	Nov. 30, 2019 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-06-02
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Total	$ 480,803
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-06-02
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Total	344,827
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-06-02
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Total	71,044
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: (nil)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Total	$ 896,674