Business Combinations (Acquired Intangible Assets) (Details) - Reeher [Member] $ in Thousands	Apr. 30, 2018 USD ($)
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired	$ 27,055
Weighted average amortization period (in years)	11 years
Acquired technology [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired	$ 18,900
Weighted average amortization period (in years)	11 years
Customer relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired	$ 7,000
Weighted average amortization period (in years)	10 years
Marketing assets [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired	$ 480
Weighted average amortization period (in years)	3 years
Non-compete agreements [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired	$ 75
Weighted average amortization period (in years)	2 years
In-process research and development [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Indefinite-lived intangible assets acquired	$ 600