Goodwill And Other Intangible Assets (Other Intangibles) (Details) (USD $)	3 Months Ended		6 Months Ended									6 Months Ended			12 Months Ended	6 Months Ended	12 Months Ended	6 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Mar. 31, 2014	Sep. 30, 2014 Customer relationships [Member]	Mar. 31, 2014 Customer relationships [Member]	Sep. 30, 2014 Non-competition agreements [Member]	Mar. 31, 2014 Non-competition agreements [Member]	Sep. 30, 2014 Other intangible assets [Member]	Mar. 31, 2014 Other intangible assets [Member]	Sep. 30, 2014 Customer relationships, non-competition agreements and other [Member]	Sep. 30, 2013 Customer relationships, non-competition agreements and other [Member]	Sep. 30, 2014 Weighted Average [Member] Customer relationships [Member]	Mar. 31, 2014 Weighted Average [Member] Customer relationships [Member]	Sep. 30, 2014 Weighted Average [Member] Non-competition agreements [Member]	Mar. 31, 2014 Weighted Average [Member] Non-competition agreements [Member]	Sep. 30, 2014 Minimum [Member] Customer relationships [Member]	Sep. 30, 2014 Maximum [Member] Customer relationships [Member]
Other intangible assets by major class
Gross carrying amount	$ 394,488,000		$ 394,488,000		$ 385,714,000	$ 351,908,000	$ 345,199,000	$ 42,380,000	$ 40,316,000	$ 200,000	$ 199,000
Accumulated amortization	(141,461,000)		(141,461,000)		(126,878,000)	(118,997,000)	(107,577,000)	(22,440,000)	(19,287,000)	(24,000)	(14,000)
Net carrying amount	253,027,000		253,027,000		258,836,000	232,911,000	237,622,000	19,940,000	21,029,000	176,000	185,000
Other intangible assets, useful life														17 years	17 years	6 years	7 years	7 years	25 years
Intangible asset residual value	0		0
Amortization	7,905,000	7,247,000	15,657,000	14,476,000								15,000,000	13,900,000
Estimated future amortization expense in remainder of 2015	14,800,000		14,800,000
Estimated future amortization expense in 2016	28,400,000		28,400,000
Estimated future amortization expense in 2017	26,500,000		26,500,000
Estimated future amortization expense in 2018	24,800,000		24,800,000
Estimated future amortization expense in 2019	22,800,000		22,800,000
Estimated future amortization expense thereafter	$ 135,700,000		$ 135,700,000