Goodwill And Other Intangible Assets (Other Intangibles) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Mar. 31, 2015
Other intangible assets by major class
Gross carrying amount	$ 420,749		$ 420,749		$ 389,209
Accumulated amortization	(157,308)		(157,308)		(144,690)
Net carrying amount	263,441		263,441		244,519
Amortization	8,621	$ 7,905	16,736	$ 15,657
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Estimated future amortization expense in remainder of 2016	16,700		16,700
Estimated future amortization expense in 2017	31,700		31,700
Estimated future amortization expense in 2018	29,500		29,500
Estimated future amortization expense in 2019	27,400		27,400
Estimated future amortization expense in 2020	25,800		25,800
Estimated future amortization expense thereafter	132,300		132,300
Customer relationships [Member]
Other intangible assets by major class
Gross carrying amount	370,767		370,767		345,805
Accumulated amortization	(129,514)		(129,514)		(120,321)
Net carrying amount	241,253		241,253		225,484
Non-competition agreements [Member]
Other intangible assets by major class
Gross carrying amount	49,782		49,782		43,204
Accumulated amortization	(27,751)		(27,751)		(24,335)
Net carrying amount	22,031		22,031		18,869
Other intangible assets [Member]
Other intangible assets by major class
Gross carrying amount	200		200		200
Accumulated amortization	(43)		(43)		(34)
Net carrying amount	$ 157		157		$ 166
Customer relationships, non-competition agreements and other [Member]
Other intangible assets by major class
Amortization			$ 15,900	$ 15,000
Weighted Average [Member] | Customer relationships [Member]
Other intangible assets by major class
Other intangible assets, remaining amortization period			17 years		17 years
Weighted Average [Member] | Non-competition agreements [Member]
Other intangible assets by major class
Other intangible assets, remaining amortization period			6 years		6 years