Revenue, Receivables and Contract Assets and Liabilities (Details 5) $ in Thousands	Aug. 31, 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	$ 442,666
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	286,223
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	46,800
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: (nil)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Total	$ 775,689