Intangibles (Narrative) (Details) $ in Millions	9 Months Ended
	Jan. 31, 2018 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization expense	$ 4.1
Estimated amortization expense, next twelve months	49.0
Estimated amortization expense, year two	49.0
Estimated amortization expense, year three	48.7
Estimated amortization expense, year four	45.7
Estimated amortization expense, year five	$ 45.7