Restructuring By Type (Details) - USD ($) $ in Thousands	6 Months Ended		12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Mar. 31, 2016
Restructuring Reserve [Roll Forward]
Fiscal year 2016 charges	$ 2,632	$ 0
Brand Realignment
Restructuring Reserve [Roll Forward]
Fiscal year 2016 charges	27,400		$ 24,800
Paid in cash	(11,800)		(1,800)
Paid in cash	(100)		(10,100)
Liability as of March 31, 2016	12,900
Additional charges	2,600
Liability as of September 30, 2016	3,600		12,900
Lease Termination Costs | Brand Realignment
Restructuring Reserve [Roll Forward]
Fiscal year 2016 charges			8,900
Paid in cash	(6,800)		(1,200)
Paid in cash	0		0
Liability as of March 31, 2016	7,700
Additional charges	1,500
Liability as of September 30, 2016	2,400		7,700
Severance Costs | Brand Realignment
Restructuring Reserve [Roll Forward]
Fiscal year 2016 charges			4,000
Paid in cash	(3,200)		(600)
Paid in cash	0		0
Liability as of March 31, 2016	3,400
Additional charges	1,000
Liability as of September 30, 2016	1,200		3,400
Leasehold Impairments | Brand Realignment
Restructuring Reserve [Roll Forward]
Fiscal year 2016 charges			5,800
Paid in cash	0		0
Paid in cash	(100)		(5,800)
Liability as of March 31, 2016	0
Additional charges	100
Liability as of September 30, 2016	0		0
Software Impairments | Brand Realignment
Restructuring Reserve [Roll Forward]
Fiscal year 2016 charges			3,800
Paid in cash	0		0
Paid in cash	0		(3,800)
Liability as of March 31, 2016	0
Additional charges	0
Liability as of September 30, 2016	0		0
Other | Brand Realignment
Restructuring Reserve [Roll Forward]
Fiscal year 2016 charges			2,300
Paid in cash	(1,800)		0
Paid in cash	0		(500)
Liability as of March 31, 2016	1,800
Additional charges	0
Liability as of September 30, 2016	$ 0		$ 1,800